Military terms, even if it involves colloquial terms, are important. These are slang or informal words or phrases that usually have a serious meaning. Sometimes, these terms can come in handy when you are in the middle of an operation. You can talk freely among yourselves without fear that the enemy will understand your next move.
There are codes that cannot be revealed to the public because they are top-secret and can compromise military operations. However, there are conversational military terms that will sound funny to civilian ears, but to our modern day heroes, mean something quite serious.
This refers to the military alphabet A and C. It stands for ass chewing or in formal terms, a verbal reprimand.
These are armored vehicles (e.g. Strykers, tanks, etc).
This term refers to a medic. It was used by the troops during the Vietnam war.