Looks like some carrots, a hamburg steak (ground beef patty) and a piece of roast beef, like what Arby’s and similar fast food places serves, where the beef just comes in a plastic bag with basting juices and you basically just steam/wet bake it. Not a whole lot of opportunity for maillard browning to happen in a wet cooking environment like that, and when you cook beef hard for a long period of time (a good way to make sure it’s safe to eat), it ends up grey in color.

The finest quality of gruel for their troops, thanks for their service LOL