[QLoadoutOTE=Prinz Eugn;86165194]That always boggled my mind. Jetpack has a jetpack, so why doesn't sprint have special super boots or camo have silver gauntlets or something? AA's were annoying enough in basic concept, but their implementation was really depressing.[/QUOTE]
I ran through the Halo 4 art book at a Barnes and Noble once and there was actually art in there that suggested they tried this. Problem is, the sketches were really goofy, even by Halo standards. Armor extensions weren't labeled to particular AAs, but guessing which were which, Sprint had mechanical space stripper thigh-high boots, Promethean Vision had cereal box x-ray goggles, and I think an overexxagerated neck guard with a projector was Hologram.
I think an ideal way for them to get their shit together would be by having a subtle, front-facing armor attachment, but with the key difference that there's a very brightly color-coded diode on the profile. Of course, the more powerful the AA, the more obvious the tech could afford to be - culminating in Active Camo having the arbiter's curvy chest-collar strip thing, if they really want to keep Camo an AA. That way if a Spartan had a big red stoplight on his chestplate you'd know he had Prom Vision, big yellow light near the abdomen = Hologram, etc.
A "Loadout Vision" AA could be fun too. Or even - and bear with me here - you could see people's active loadouts on the back button scoreboard!