[Dubious]

Away team size: This is always a fixed percentage of the total crew capacity. Officers assigned to away missions are added to the "crew/red shirt" part of the team. (The Captain is always the last of the officers to die; "red shirts" are always first.) The HP of the away team is based upon the total number of members, plus benefits from abilities, so adding officers increases the overall HP of the team.

You can change the away team equipment through the "Install Components" screen (F7). Away Team components have "(AT)" appended to the name. Note when you buy gear through the Stations, it is automatically installed regardless of what is currently in use. So, it's a good practice to always check what is equipped immediately after you buy gear.

AT gear not in use takes up cargo space.

-Dubious-