The deployment screen won't show a full list of players. Seems to stop at 10 with no ability to scroll [only tested with 1440p]. I've been on a server with more than 20 and couldn't scroll to see who's on which team.

Holding P on PC brings up the player list on the deployment screen but there is no indication you can do this. So you can see it there but the USA Tab is missing, albeit you can still select USA tab via Q and E keys.