"Look, we know you're new to this command, but the army field manual is very clear on the subject of squad stereotype composition. Every squad must include: 1 quiet religious guy who goes insane, 1 maverick loose cannon who plays by his own rules and dies in a blaze of glory, 1 covert recon opperative with a dark past who at first betrays the team but then has a last minute crisis of conscience and nobly sacrifices himself for the greater good, 1 fresh faced new recruit who survives but loses his innocence and learns to become a man and 3 or 4 other guys who you don't care about so they can get brutally shot so you can show how serious the war is."War stories have a number of different levels of focus, from the global strategic level all the way down to squad tactics, and even the plights of individual soldiers on the battleground. When the focus is at the smaller end of the scale, we get The Squad. Very often, this is a squad composed (like a Five-Man Band) of interlocking character types or roles. There are quite a few similarities with the types and roles of the Command Roster. The main difference is the Command Roster is a very specific combination of skills that may not be strictly military. The Squad may be a Badass Crew and have a Squad Nickname. If it's made up of women, it's an example of an Amazon Brigade.
—Loading Ready Run makes it official.
Some of those character types and roles:
Some The Squad series: