Redshirt

A "redshirt" is a fan-derived term which refers to a specific class of character featured in the Star Trek franchise mythos. Redshirts are Federation crew members who are considered expendable and usually only make one appearance. Often times they are selected for a specific away mission in which they are killed. Though these "cannon fodder" characters stem from nearly any department on a starship, more often than not, they are either specialists or tactical officers who wear red tunics.