Korther:Would we lose to an army from 500-600 years ago? Hardly, we'd completely demolish them. Let us look, at the various UNSC future technologies:
ODST's/Hell Jumpers - Can send in dozens, if not hundreds of units roughly equivelant to our Rangers/Green Berets in a matter of a minute onto any place on the battlefield that a man can walk on and something can fall on.
Flamethrower Squads - For those of you who don't know, it's against international law (or at least U.S. military law) to use flamethrowers of any kind in military combat.
Hawks/Hornets - Let me put it like this. They have better bullets than our helicopters machine guns, they can strafe MUCH better than our helicopters who rely on a single overhead roter. Hornets are MUCH more flexible, and can carry two units on them with any weapon they want. Hawks have lazers, and plus Hawks/Hornets would be flying overhead dodging every missle shot at them (or most). You know those anti-air vehicles we have? Would be generally worthless.
Cobras - Shots of PURE energy, can tear apart our armored vehicles. Maybe even garrisoned buildings.
Sniper Rifles - Please note, that the UNSC sniper rifles are roughly equivelant to our .50 Calibers, all of them. Let me also note, that .50 Calibers in the U.S. are banned from being used against personell, however not so much for the UNSC even though they are not called .50 calibers. And even though it's not in Halo 1,2,3; physically, a gun's bullet that strong (and it's been shown from our .50 cal) that comes within a foot of you, will TEAR the flesh off your skin.
Vultures - I want you to imagine an F-16's or F-22's Javeline Missle, or any other form of missle. Then I want you to imagine about 10-12 of those, being shot at once in a single direction. I want you to imagine four cannons, able to be shot semi-automatically that shoot something roughly equivelant to tank shells. Then put that in a highly armored, space capable flying machine.
Pelicans - We can transport armor, personell, and even supplies much more efficiently on the field with these. A pelican can hold, what 16 men or something? Dropped off anywhere, then you can add a Scorpion tank with that. That's pretty darn good reinforcements for one pelican, now add in 5 of those. Now we got paratroopers, however those are generally innacurate in landing and can not transport armor. I suppose we have Black Hawks, however those carry what, 8 men and no vehicles possible? Might I also add, are much more vulnerable to weapons fire.
Mac Blast - A kinetic strike, capable of taking out, oh let us say the White House in a single shot. The Pentagon in like, two. This has such destructive capability, with no way to strike back.
Cryo-Bomb - Self explanatory. Dropping extreme cold, can stop an entire helicoptor advancement from the U.S., can stop an entire army in it's tracks, etc.
Battle Ships - I want to point this out to everyone. Spirit of Fire is NOT a warship. That was a colonial ship, that was turned into a fighting ship. War ships are what we saw in like, Halo 1, 2, 3. Those things were MUCH bigger, and much more powerful. We can not hope to take these things down, especially in the outer-atmosphere without using a Nuke at the least. Which the Nuclear Fallout would affect everyone within a very wide range of the explosion due to the radiation. Plus, each war-ship can hold THOUSANDS of armor and aribourne units. Tens, if not hundreds of thousands of units per battleship. Like, 12 battle-ships can outnumber our entire army 2 to 1.
Spartans - Can dodge bullets...
Rocket Launcher - Short and sweet this one is. Can fire two rockets at a time, and reloads faster than it takes to reload one of our Rocket Launchers. Which only fires 1 rocket at a time, by the way.
Note: Please don't use the crappy Halo 1/2/3 Marine AI as an excuse to say the UNSC will lose. It's a very moot point.
First of all let me say that I'm am siding with the US because of the fact I think they are better.
To felix:
OK, first of all, you can't compare an f-22/35(fighter) to a longsword(bomber/SPACE fighter) what you can compare though is the B2-stealth, or better yet the SR-71 blackbird. And in this case, the SR-71 would win because of its mach 3 capabilities and its undetectable by radar.
Abrams would a scorpion any day, more armor,weaponry,power(abrams 120mm cannon, scorp 105 mm shells) and speed(45 mph, scorp looks like only 25 or so).
AIs could infiltrate the system but they would just cut the hard lines, and next time they are in the verge of getting hack they could, would, destroy all data in their hard drives, sound familiar?
Spartans would make a difference but there are only 3 alive that are ready for deployment(gray team, "halo:cole protocol"). They wouldn't change much.
Yes, the UNSC had survived the first halo with superior tactics, but to WHOM were they superior to? The covenant, which if you hadn't noticed doesn't rely on tactics but superior tech and vast numbers. The US on the other hand actually uses tactics to prevent casualties. Aslo, you don't see a blackhawk go down a lot because we are fighting un-organized terrorist who use RPGs where we would use AtA/GtA missiles(air-to-air/ground-to-air) to take down air units.
Also, the army Rangers,Green Berets and Seals are superior to the ODSTs, and thats not counting spec ops soldier from other countries like the SAS and the spetsnaz. Also, the current US marines are highly trained compared to the US army, which I'm pretty sure is what they use but call them "marines" due to the fact that they ride on ships.
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To Kordude
They are practically ordinary marines but with training to use a HEV. They are nothing like the green Berets or Rangers. If you can, please tell me where it says they have much more extensive training then ordinary marines(not counting HEV training).
Flamers are banned :'(
An F-35 would rape a hawk and don't tell me bout the hornets. F-35 has a vertical propulsion system, allowing it to strafe, rotate and even stop in mid-air. Also, the hawk's lasers can easily miss other flying aircraft as can other forms of lasers(try taking out a banshee with a gauss hog without missing a shot, now have that but faster = F-35) while we have missiles that can lock on to transmission signals rather than heat(which can be tricked by flares).
Cobras are powerful but can easily be stopped by an abrams tank.
.50 cal snipers are not banned from war. Also, the halo sniper isn't a .50 cal, its ammunition is only 114 mm and 50. rounds are bout 138 mm, still big though.
Vulture are giant flying targets of doom, meaning that a goo f-35/22 strike will destroy it in seconds. Not really worth the cost if it could get destroyed easily.
The MH-53 pave low can hold a max cap of 55 passengers, not counting the 6 man crew. It also has 3 .50 machine gun place on the sides and rear, along with a chin gun. Though it cannot go into space, its excellent for combat search and rescue and drop off. They can also lift armor and take it the battlefield.
2 mac blast CANNOT take out the pentagon. The pentagon can withstand NUCLEAR blast, didn't you noticed that when the plane hit, it barely did anything? The pentagon also have over 5 floors underground of concrete and reinforced steel within each wall and floor. As for the mac, yes it is an advantage but I am ruling out anything to do with space.
A real life cryo bomb would KILL the people it affects, not just freeze them like in the game.
Warships. The warships you are talking about CANNOT go planet side. Only small warships and colonial ships can do that, but even if you used only colonial ships, you would still out number us. But that wouldn't be an even fight now would it?
Spartans, overrated. Like I said earlier^ only 3 would be available for you to use and 3 would make much of a big difference.
Rocket launchers. I don't know if you know this but the US marine core uses disposable rocket launchers, as in one use only. This allows them to lighten their load once they use them. Since they are small, light(less then 20 lbs) and disposable, every marine can carrie one without leaving behind their primary weapon. So once your rocket guy runs out of ammo he is screwed because isn't going to walk around with heavy rocket launcher, ammo for it, normal supplies PLUS his assault rifle and clips so he has to use his pistol while our guys have rockets and a machine gun/shotgun/rifle.
Please Note that we would have a pretty even fight but have the US come out the victor if A) all of the world was part of the US(you guys have multiple planets, when we just need 1) and B) you don't add warships/colonial ships into the mix.
I survived the flame wars, I survived the newb flood, and now they expect me to start all over just because they added in some stupid live crap? no, I used to go by Dark Medicant Bias but they took it all away. And now, its their turn to try to survive...