What part of the group they're in. from CCosgames's blog

Usually, as in the case of the 501st Legion, the costumes are designed to be as accurate and sensible as feasible.  Etaya  Usually, when not in costume, the armor, uniform, or gowns are saved in a rolling trunk, with the character’s call, and what part of the group they're in. 

For example, participants in Los Angeles are referred to as the “LA Garrison” There’s additionally the Dune Sea Garrison, regarding Arizona, and the Cloud City Garrison, regarding Oregon, and, well, you get the concept. It’s a truely exciting device, that’s honestly nicely-designed. Captain America Costume