“Several of the Department of Homeland Security’s (DHS) Federal Protective Service’s (FPS) guard requirements are generally comparable to those of the six selected agencies GAO reviewed, but FPS faces challenges in some aspects of guards’ training. FPS and the six selected agencies GAO reviewed require basic, firearms, and screener (x-ray and magnetometer equipment) training for their armed guards. However, GAO found that providing screener training remains a challenge for FPS.”