Location: USA (I guess, since I'm not talking about any war in particular)
Search terms used: us marines+alerts, cooper color code, usmc condition codes, usmc radio codes yellow red, etc.
I'm writing a fic involving a wounded private first class marine in a hospital recuperating from losing his eye in a mission gone wrong. During this mission, he and a comrade were supposed to follow a couple known terrorists and basically chase them to the rest of the brigade so the other troops would take them out. Well, when the marines follow them, they find that the enemy had already assembled a group for an offensive move, and more or less ambush the two. They're forced to retreat around the corner of a building and try to call their comrades for backup.
I know nothing about what sort of code/lingo they would use, if any, when contacting the brigade. I looked up the Cooper Color Code, but those are more "states of awareness" than calls for help. So what are some codes that would translate to "something's gone wrong. We've been ambushed, and one of us is wounded - send help"?