I think the team kinda discussed this in the last ep about empire and the growing incompetence of the us military and its offshoot federal forces.
These DHS “agents” are not the best people the US military has to offer, these are the runoff, the rejects, the kid who was bullied in school and swore that he would never be bullied again, next time some one had their skull cracked it would be him cracking the skull of some POS. This guy is dressed for combat in Fallujah to the point where his gear makes him a sitting duck. At the same time he has that suburban dad physique and is carrying his riot shield like he was getting equipment out of the shed.