Mini map: grids. 9 to 16 grids so that players can coordinate locations better. Possibly allow officers to "plot" beacons on the grids to call for help?
Achievements: cuff chevrons, perhaps, to denote play time or level-up? Sort of how some military branches denote years of service. Understanding the difficulty to customize per player, but an easy and visible way to denote "level". Or give chevrons next to the players name.