So I'm looking into the "Marine" situation on this short film, and it looks like they are wearing Legacy Effects ODST armor, sans backpack for most of them, and sans gauntlets. Also, the helmets aren't ODST helmets, they are Reach Marine/Army helmets. Of what I can tell (through faded lighting and smoke and rubble, mind you), it looks like they are based on the same costumes in the previous live-action short (everyone's favorite all-talk one), but with the thigh armor being worn on the legs instead of tucked up under the backpack, and the shins/knees added back.
Yes, that is interesting. The "marines" in the "patrol" short had on odst armor (with no helmets) . I would like to see some of those unsc army helmets UP CLOSE AND PERSONAL!! lol