I was listening to John/Ken show out here..a caller confirmed suspect was ex-military (can’t recall but think caller said Navy)..also, he was wearing body armor.
Theres some sort of fouled anchor emblem on the chain around his neck. The chain's heavier than a military dogtag chain, but I'd bet that the fella has been out of the Navy for quite sometime, based on his weight.
The body armor report sort of explains why the cops left him with his shirt pulled open. Looks like the buttons are still in place, but it may be a bit difficult for him to fasten them with his hands in back.