http://en.wikipedia.org/wiki/AMMO_%28U.S._Air_Force%29
That's the general scope of the career field but for the past 4 months i've been working the Storage element of the job:
""Storage" is responsible for storing and breaking out munitions required by CM and Inspection, and is also responsible for the maintenance of the munitions storage facilities, usually called "igloos", "magazines", or revetments ("revvies".) Storage is also used to transport munitions over public right-of-ways to transfer munitions between different storage or shipping and receiving locations. Storage troops operate the majority of the heavier equipment found in the bomb dump, including "18 wheelers", and heavy-rated forklifts, front-end loaders, and cranes. Storage troops can be thought of as the arteries of AMMO."