We have two that I question whether they would do what needs to be done. I have seen indicators in both that worry me. They're both long stories, I'll just leave it at- when they're around I consider myself alone and change tactics accordingly
I will admit that we have one guy that's so lazy, it's a good thing for him that breathing is a non voluntary motor reflex. As lazy as he is, I always used to see him hovering in my area when I was involved in something. The only initiative he ever seems to take is to be in aroundto provide back up if necessary. That balances out a lot of his other failings
I can say I've never had to deal with anyone who was a known coward (they usually washed out early). Every female I've worked with was more than willing to mix it up if necessary.
Now, I've worked with some who are useless, and some who are treacherous (which I guess is as bad as cowardly).
One I couldn't peg was a guy I worked with on Dallas PD. This guy was so huge (I mean overweight) he couldn't get anyplace in a hurry. But he was also strong as an ox, and if he made it, you were in good hands. He would grab a couple combatants by the collar and leisurely drag them away kicking and screaming without breaking a sweat - pretty much an unstoppable force.