Basically, for warrant officers, it's basically something where the military finds someone who is already fully trained as something like a helicopter pilot, gives them some basic military training, and puts them in a military helicopter. This tends to happen when nations are in significant wars. They're not commissioned officers, but they're some sort of vital expert the military needs. In the Star Army, this is common. Warrant officers will be people like starship engine experts. Note that a doctor who comes in as a warrant officer would not be on a command track - e.g. he's not going to be in charge of hospitals because no significant advancement in rank is expected or possible. One of the most common warrant officer types in the Star Army is the starship operator - frequently Star Army moves a ship that's not commissioned or manned, it has a warrant officer operating that ship, who is a general purpose one-man starship crew. But this is a tangent, because players almost never start their characters as warrants because there's no advancement expected for them and the faction rules don't allow it to happen normally. Players are supposed to normally join as santo hei (typical) or shoi kohosei (if they want to be an officer and we trust them). After the first mission the shoi kohosei (meaning "acting ensign" or midshipman/cadet) character is promoted to Shoi (ensign). Since your character is an officer, it'd probably be more appropriate for us to call him a Doctor. All Star Army commissioned officers are considered to be medical doctors. This doesn't prevent you from going on away teams and such.