Doomchicken

For quite a few of the things, we're already there. For example, railguns are being tested by the US Navy, active camouflage is possible in some forms, and Lockheed Martin have designed an exoskeleton called HULC.

True, but I think Bungie wanted the humans to be identifiable with, and have them seem human, not just another on the list of aliens.

I loved the ending. In fact, it's the first time I've ever felt emotional over a video game.

I much prefer the new Pelican, and think it's great that it's got new features such as lasers, boost, better armour and more guns. After all, the UNSC now has access to Covenant technology through the Elites, why would they not use that to improve their aircraft and vehicles?

For all the things mentioned as missing, there's something new to replace it, like Prometheans Knights, Watchers and Crawlers, SPARTAN-IVs, Liches, Mammoths. Also, why complain about there being no Drones? Everybody hated Drones.

Hmmm, I didn't really consider this but it would make the fight a cakewalk for the UNSC, but then there's no debate. I'm going to edit the OP to rule out space bombardment.

Because it's better for gameplay. But, in lore, they've not had a war for, what, 400 years? That must have had a bad effect on their military. That, and the Navy taking all the budget, leaving the infantry with dregs.

The spaceship at the end of Halo 4 is the Broadsword. The UNSC wants to occupy the US, not destroy it, so MAC bombardment might not be the best route. The Pelican is Halo's chinook, not it's F22. The Broadsword is Halo's answer to the F22, and the Broadsword has energy shields. As for a Chinook vs the Pelican, I think the Pelican would win with it's lasers and rockets. I agree with the Armour and Infantry points. As for Special Forces, there's 500 SPARTAN-IVs, compared to around 1500 Delta Force and Seals combined. I'm willing to bet a SPARTAN-IV can easily take three Delta Force members or Seals.

With the exception of the Halo 2 and 3 Themes, it'd have to be Halo Wars.

I'd be a Spec Ops Elite. That way, if the fight goes bad, I could just turn invisible and hide.

The Cortana we know is dead. Her card was literally disintegrated. However, I think it;s more than likely the UNSC will rebuild her, probably using some technobabble to justify it.

I didn't count space because the modern military had literally no space power. Vultures I forgot to count, but they would provide an advantage. Same for Hawks. Sabres, however, were prototypes that were all (IIRC) destroyed when Reach fell. The Mammoth would be a big glowing target for all modern artillery, so I doubt it'd manage much. As for the Warthog weaponry, sure, it's great, but Warthogs aren't exactly well armoured. The Assault Rifle is actually awful compared to modern weapons. Sure, it beat the Covenant, but an M4A1 could do the same so much easier. The in lore range in 300 metres. Modern assault rifles have about double that.

I've seen this debate a few times, but none since Halo 4, which changes the playing field significantly. So, the scenario is, a UNSC Invasion Fleet with four and a half million Marines and all the relevant vehicles, air support, etcetera, is invading the USA. The USA and any nations willing to help it have to defeat the invasion force to win, the UNSC has to occupy the entire US and force any of it's allies to surrender. Unfortunately for the UNSC, a fluctuation in the time-space continuum resulted in the UNSC Fleet having no ammunition for it's spaceships, ruling out orbital bombardment. Air I think that in the air, the UNSC would prove victorious. The Broadsword is equipped with energy shields, which means it would be able to resist modern weapons, and it's firepower is impressive enough that it could shoot down any enemies. The Pelican in Halo 4 has lasers, which means any helicopter challenging it would be decimated. We haven't seen the Hornet or Falcon yet, but they probably have lasers or shields. Armour This is a tricky one, but I think the modern forces have the edge, mainly because the Scorpion and Warthog aren't very well designed from a practical standpoint. The Mantis is powerful, but I doubt it could take on a modern tank column. As for the Mongoose... Well, it's a non-factor, really. Infantry In terms of infantry, the modern forces would have the edge, simply because of the MA5C's awful range, and the power of modern weapons. Special Forces The UNSC has SPARTAN-IVs, so in this section they would absolutely dominate. ODSTs are also superior to modern special forces, and they can be dropped from orbit, giving them practically infinite access to target locations. What do you all think?