From Halopedia, the Halo wiki
Weapons master is a title held by Sangheili that are given command of armories, charged with maintaining and distributing weapons and other equipment amongst a ship or unit. In this role, weapons masters essentially serve as quartermasters. Although a very rare occurrence, female Sangheili occasionally serve as weapons masters. One such example is Sanj'ik, who served with Arbiter Ripa 'Moramee's Fleet of Glorious Interdiction.
List of appearances