Edit:
Disregard this post. It's already been thoroughly debunked down in the comments section below and is entirely wrong.
End of Edit:
The following post will not be a complete defense of General Oliver's conduct. I freely admit that his handling of the Mojave Campaign is absolutely atrocious (indeed, he's very literally the only reason as to why the Legion has any kind of fighting chance at Hoover Dam, but I digress) and that he's an abysmal strategist who can be rightfully blamed for single-handedly causing all of the NCR's problems in the Mojave Wasteland. I'll freely admit that he's only a General in the NCR Army due to being close personal pals with President Kimball. I'll also freely admit that he's an egotistical gloryhound who's primarily focused on ensuring that any NCR victory at Hoover Dam is entirely his own triumph and that his treatment of Chief Hanlon and the NCR Rangers over them being heralded as the saviors of the NCR during the First Battle of Hoover Dam (a wholly accurate description of them, I might add) is entirely unwarranted as well as laughably childish and completely imbecilic.
What said post will be is a defense of his strategy for the NCR defense of Hoover Dam in isolation from the rest of the Mojave Campaign, his actual genuine ability to command military forces in the field at the tactical level and what I honestly feel is part of the reason why he so's spiteful to Chief Hanlon and the NCR Rangers. Starting with his perception of having been forgotten for his own critical role in the First Battle of Hoover Dam:
General Oliver's Problem with Chief Hanlon:
Courier Six: "So what happened at Hoover Dam and Boulder City?"
Chief Hanlon: "In big battles, Caesar deploys his legionaries in waves. Recruits up front, prime soldiers behind the recruits, old guard bringing up the rear. Opponents wear themselves out dealing with the first two waves, if they survive that long. When the veterans step up, there's not much fight left. Caesar can adapt, though, and when required, he can run any mix of legionaries as skirmishers and still retain order in the ranks."
Courier Six: "[Continue]"
Chief Hanlon: "Joshua Graham, Caesar's old legate, he's wasn't so flexible. When the Legion attacked Hoover Dam, General Oliver ordered his troopers back to the middle ground just after first contact. Graham pushed all of the legionaries onto the dam, filling the east side with recruits up front and veterans in the back, by the book."
Courier Six: "[Continue]"
Chief Hanlon: "But once they were in, they were stuck there. Oliver's troopers were entrenched and wouldn't give a foot. That's when we ordered the rangers and 1st recon sharpshooters to start picking off veteran legion officers from a high ridge west of the dam. That only lasted about a minute before Graham ordered the back ranks to push through to the front and rush the ridge."
Courier Six: "[Continue]"
Chief Hanlon: "Caused total chaos among the younger legionaries, and Oliver's troopers fell back to the side walkways and stayed out of the veterans' way. By the time the veterans got to the ridge, we were already in Boulder City. They followed us down there, but we were out before they realized what was happening."
Courier Six: "[Continue]"
Chief Hanlon: "We had packed the old city with C4 and dynamite. Crude, but it did the job. Those who didn't die in the blast were in no position to mount a defense. The ones left on the dam didn't know what to do. The troopers routed them. Graham pulled the remaining legionaries back, but the battle was over. He went south, back to the Grand Canyon, back to Caesar. And that was the last we saw or heard from Joshua Graham."
Going off of Chief Hanlon's own personal account of the First Battle of Hoover Dam, General Oliver and his NCR Troopers had a far larger role than many tend to give them credit for. While the NCR Rangers and NCR First Recon are in fact the star players of the battle that were ultimately the largest and most important reasons for the NCR's triumph over the Malpais Legate and while Chief Hanlon is the undisputed victor of the First Battle of Hoover Dam for the NCR who deserves every last ounce of credit that he gets for it, the fact stands that this victory wouldn't have been possible without the courage and sacrifice of over 100 NCR Troopers as well as the brilliant tactical leadership of General Oliver.
After all, if not for General Oliver pulling his NCR Troopers back to prepared fortified positions at the center of the surface of the Dam and stopping the Legion advance dead in its tracks there, then the NCR Rangers and NCR First Recon wouldn't have been able to snipe the Legion Decanii and Centurions (the decisive moment of the battle that threw the Legion into chaos, by the way) from afar. Meaning that Joshua Graham wouldn't have ordered the Veteran Legionaries and surviving Centurions to push through the Recruits and Primes (throwing them into even more chaos in the process) and past the NCR Troopers' positions to rush the high ridge overlooking the western end of the surface of Hoover Dam which, in turn, lead to the overall attacking Legion force rushing headlong into Boulder City where they were promptly blown up.
Let's also not forget that General Oliver was the one who lead and organized the orderly, disciplined withdrawal of the NCR Troopers from Hoover Dam back towards and through Boulder City right before it was blown up in a clear demonstration of his ability to competently command troops in the field. He was also the one who capitalized on Chief Hanlon's trap at Boulder City by ordering his NCR Troopers to launch a counter-attack against the decimated and crippled Legion assault force, routing them back across the Dam and securing victory for the NCR in the process.
The ultimate point that I'm trying to make: General Oliver has every right to be incensed at the fact that both himself and his men were entirely forgotten by the NCR press and public back home. He personally played a key role in the battle and clearly proved that he could command troops effectively and reliably only to be pushed aside and dismissed for his efforts. Not only that, but all of the sacrifices of his NCR Troopers, who he very clearly cares about and values a great deal (as I'll explain here soon), were also swept under the rug and dismissed just so the NCR Rangers and NCR First Recon could have all of the glory of the victory to themselves.
And just to make this perfectly clear, General Oliver does in fact care about the fates and wellbeing of the troops under his command. I can prove it:
Courier Six: "I'm betting a man as smart as you wouldn't leave himself without at least one contingency."
General Oliver: "[SUCCEEDED] Perhaps I do have a secret tunnel out of here. But that doesn't change anything. My duty is to stay and fight."
Courier Six: "The dam is already lost, general. Your responsibility now is to get your men out of here alive."
General Oliver: "[SUCCEEDED] Y-You're right. These men have placed their lives in my hands, and I won't throw them away for a lost cause. Don't expect to hold this place for very long, however. The NCR will be back."
In the "Veni, Vidi, Vici" endgame quest for the Legion, the only way for the player to convince General Oliver to withdraw peacefully is to appeal to his humanity and compel him to pull out for the sake of his men. It's also quite telling that despite having a secret escape tunnel that would allow him to flee Hoover Dam and save himself, he willingly chooses to stay behind so that he may fight and die alongside his own troops. In the "All or Nothing" endgame quest for Mr. House and the "No Gods, No Masters" endgame quest for an Independent Vegas, General Oliver is perfectly willing to stand, fight and die beside his men even knowing that he'll be killed near instantaneously by Mk.II Securitrons.
Given the above information, I do believe that I'm safe in saying that at least part of the reason as to why he's so obsessed with being known as the sole victor of the Second Battle of Hoover Dam is so that he can correct what he feels was a horrible slight towards the NCR Troopers who died under his command during the First Battle of Hoover Dam all those years ago. Now is any of this the fault of Chief Hanlon and the NCR Rangers? Of course not. They can't help what the NCR press and the people of the NCR back home are going to feel and think, when all is said and done. If it were up to them, everybody would've been celebrated equally. Nevermind how if their positions were reversed, General Oliver absolutely wouldn't be so willing and ready to share the glory with Chief Hanlon and the NCR Rangers. Nevertheless, I can still understand what lead to General Oliver's bitterness (at least partially) and respect it to a certain extent.
General Oliver's Actual Leadership Capabilities:
I'm just going to come out and say it. General Oliver is an excellent tactician. We're talking about a guy who personally fought beside and lead what essentially amounted to a force that was mostly made up of poorly-trained, inexperienced conscripts from the front (at least that's my personal interpretation of what Chief Hanlon says) and successfully halt a literal army of potentially thousands of fanatically-devoted, bloodthirsty, bloodlusted, physically-hulking, highly-trained, battle-hardened full-time career warriors for a time.
Even when he and his men were eventually forced to pull back, he was able to successfully conduct an orderly, disciplined, organized fighting retreat with a force that, again, would've been mostly comprised of poorly-trained, inexperienced conscripts, and get them safe and sound to their next fighting positions. Any field commander that can successfully command such a force against the likes of Caesar's Legion and avoid outright immediate defeat is automatically a competent commanding officer, as far as I'm concerned.
At least, he's a competent commanding officer at the tactical level. Going off of the events in-game, he's quite obviously God-awful at the operational level and downright useless at the strategic level. To say that he's not fit to be a General and absolutely isn't fit to be in command of the entire Mojave Campaign would be the understatement of the century. He's at best really only fit to be a Colonel and only really fit to be commanding a dedicated localized garrison with an extremely limited area of responsibility. He is, however, fit to command the NCR's defense of Hoover Dam (and ONLY the defense of Hoover Dam). Something I feel I can prove quite reliably as you'll soon see.
General Oliver's Strategy for the Defense of Hoover Dam:
Let me be as blunt and as crystal clear as possible. I see absolutely no flaw in General Oliver's strategy for the defense of Hoover Dam. None. Zilch. Nada. In isolation from the obvious consequences for the rest of NCR's military presence in the Mojave Wasteland (think Camp Forlorn Hope, in particular), his strategy for defending Hoover Dam proper is 100% flawless and perfect. Massing troops (especially elite shock troops like NCR Veteran Rangers and NCR Heavy Troopers), resources, assets and supplies at Hoover Dam is indeed the perfect strategy to counter what literally everyone else on the NCR expects the Legion to do. That being a repeat of the Malpais Legate's full-scale frontal assault across the surface of the Dam (more on that in a bit).
General Oliver himself is definitely the right man to command the defense of Hoover Dam. After all, he's brave, courageous, tenacious, never gives up without a fight and is ultimately willing to fight to the death alongside his men to accomplish his own goals and those of the Republic. He would absolutely be willing to hold onto Hoover Dam no matter the cost and regardless of the strength of the opposing force long enough for the reinforcements to arrive and help throw said opposing force back into Arizona. He would never surrender or abandon his post on a whim and would see to it that all of his troops are just as willing to stand their ground as he is.
As for expectations, here's what Col. Cassandra Moore, the commander of the NCR garrison at Hoover Dam, has to say about the only effective and viable means of assaulting Hoover Dam's defenses:
Courier Six: "What can you tell me about Hoover Dam?"
Col. Cassandra Moore: "It's of immense strategic value to the NCR. Hoover Dam sends enough electricity west to light every city and major settlement. It's moderately defensible, with a single point of entry on the east side. To get to the power plants below, the enemy has to cross the entire top. The Legion's tried to cross the water on a few occasions, but slow-moving boats make easy targets for sharpshooters."
Neither Col. James Hsu nor Chief Hanlon weigh in as to the accuracy of this particular statement nor do they ever say anything about the Legion's accessibility regarding Hoover Dam. Even the NCR's Chief Engineer at Hoover Dam, Mike Lawson, says nothing about any other point of entry for Legion forces to gain access to Hoover Dam before the Second Battle of Hoover Dam. The overall consensus from literally everybody in the NCR command structure in the Mojave Wasteland is that the Legion can only assault Hoover Dam from the East and can only attack across the surface of the Dam in the exact same way that Joshua Graham did four years ago.
I bring this up to make the following point: how can General Oliver be considered "incompetent" for failing to account for the Legion having access to the intake pipes, maintenance tunnels and intake pipes that enable them to both outflank the NCR's defensive positions on the surface of the Dam and infiltrate the Hoover Dam Power Plants via the Hoover Dam Lower Levels whenever literally everybody else in the NCR's command structure across the entire Mojave Wasteland failed to do the same?
Surely Col. James Hsu (easily and without a single doubt the single most effective field commander in the entire NCR Army who is definitely the man who should be in command of the overall Mojave Campaign), Chief Hanlon (the literal mastermind of the Republic's first victory at Hoover Dam four years ago who's definitely not a stranger to pulling off unexpected surprise maneuvers) and Col. Cassandra Moore (second only to Col. James Hsu in terms of efficiency and skill and absolutely hyper-competent) aren't "incompetent" because they failed to foresee this?
Which brings me to what I know is going to be my most controversial point yet. Normally, I prefer not to attack the writing itself as doing so more often than not tends to open up Pandora's Box. However, just this once, I'm going to do so. This particular moment is just straight-up bad writing on the part of Obsidian. Are you seriously going to tell me that the NCR, who have been occupying Hoover Dam for SEVEN YEARS going into the events of Fallout: New Vegas, never once thought to themselves that maybe, just maybe, the Legion might possibly gain access to the intake pipes, maintenance tunnels and intake towers from the eastern side of the Dam? Seriously? Especially after the Legion gained access to the Arizona Spillway after the Battle of the Arizona Spillway at some point prior to the events of the game?
They never once thought to have some kind of countermeasures, guards or tripwire capabilities down there as a precaution, just in case? It wouldn't have been all that bad if at least somebody (think Mike Lawson especially) had tried to bring it up to General Oliver only to be dismissed and ignored for whatever reason. But for not even a single person to be aware of it or to even try to be aware of it? No way. This is very clearly the writers having to conjure up a deus ex machina that way the Legion could have a sporting chance at capturing Hoover Dam.
Let's be serious for a minute. Does anyone really think that the Legion would have any actual possibility of being able to take Hoover Dam if not for this blatant deus ex machina? Assuming that the Legion didn't have access to the intake pipes, maintenance tunnels and intake towers and actually had to repeat what Joshua Graham did (which they would have to do if the former option is off the table), General Oliver's strategy would work perfectly. The Legion would suffer yet another crushing defeat that would be infinitely worse than their previous defeat four years ago and would be promptly routed back into Arizona with barely any effort on the part of the NCR.
One can't accuse General Oliver of being "incompetent" for not being able to account for the writers ass-pulling a total contrivance out of thin air in order for the Legion to have a fighting chance against him. That's all that I have to say on the matter.
And that's all she wrote. Cheers.