I just wonder if some offensive explosive training might be warranted in today's threat environment. I cringed a little reading the discussion on C4 and guessing how much to use, how much det cord it takes to detonate it, and relying solely on over pressure. I was a Combat Engineer and used C4 quite a bit. You can make offensive explosives that don't make shrapnel and don't rely solely on over pressure. With active shooters holing up, suicide bombers, etc. I see no reason to send humans in to the line of fire when a human controlled machine can do the same thing.