That was a blatant descriptor right there. Easy to understand, but uncomfortable to read.

have they thought of just- using a MAC round from orbit? it would definitely do the trick.

There are a few jarring grammar errors throughout your writing. It's easily fixable by editing it yourself, using a grammar extension, or getting a beta. I suggest you look into one option as most Native English speakers will get drawn out of your story when lines like "if the students managed to blow your cover and treated you like a hostile" are rampant throughout the story. It's understandable but it just feels slightly off. You're using the past tense to talk about things that might happen in the future.

She can't keep up with a Spartan, so this makes little sense in Noble's duel.

IS would not win on the ground at all. Anti-air would quickly annihilate them, to say nothing of the man-portable and vehicular anti-armor weapons used by the UNSC. Plus, take Charlotte's IS for an example. It is effective against other IS...despite using normal firearms. UNSC small arms, you will notice, not only have no bullet drop but each bullet leaves a glowing trail. Not a bolt like a tracer would cause, but a trail. This implies the bullets are glowing hot. Also, UNSC bullets are depleted-uranium cored titanium coated FMJ. They have immense mass, heat resistance, and stopping power. The glowing trail exist in space, too. So, most likely there is a degree of magnetic acceleration in the barrel and the chemical propellant simply works together with the magnetic portion to create an extreme powerful weapon. Also, the UNSC operates the Gremlin EMP vehicle and uses EMP grenades and other things. IS would have no chance at all. Even against infantry.

This seems to be an interesting story and you're doning some goodthings when writing it and your doing some bad things.

First thing ive noticed about how you right is that it is very repetitive. You seem to say the same thing over and again, for example here and their in this chapter you as the narrator will say some one said some thing and then you will have the character repeat what the narrator said.
Ex: he turned and said for him to get to safety
"Get to safety."

One way to maje that flow better and make it seem less repetative is to do some thing like this
He turned and said, "get to safety

this isnt a story, is a script. its all dialouge. really hard to read.

It is hilarious how no one seems to truly grasp how utterly outclassed they are against the UNSC. If it came to a war, their militaries would be dead long before the first boot hit the ground. Given the prevalance of powerful orbital bombardment and various WMDs in Halo, it seems guaranteed there are many potent countermeasures always in place, anyway. Plus, I have noticed that forces always seem to dive right into the thick of it, so one of the counter strategies is likely simply being so close that the enemy cannot use WMDs without destroying their own army.

Welp, the Covenant is fucked. If there is one way to get the IS genius focused and getting shit done, it’s a xenocidal alien threat and a couple omnicidal ones. She shares her knowledge (or just invents things to be mass produced using whatever the UNSC knows of Forerunner tech) then sits back and watched the space monsters be purged by her creations.

Of course, then we wouldn’t have a story.

Huh, and I thought you're already in the K.I.A List, Guardian~ [Jokes]

(Although please do not delete this story, it's still pretty good to keep and rereading this one.)

Hope to keeping your Rewrite version alive this time...

Hey mate, your concept is good. However the grammar realy needs some work

the Spartan are too ooc man

your writing is meh, but its these time skips that are near unreadable.

You need to fix the A.I.'s serial code ID number. For example, Cortana's ID Code was/is: CTN-0452-9.

Pls continue this fanfiction I really like it