Have several, posted one or two. Some are not from my time in Phase 1, but as an "aggressor" for another class after Engineer training. Three weeks or so after "arriving" into/at Mackall, we were on patrol exercises. After being ambushed on a previous patrol one of the guys figured out that by peeling back the tape on the bottom of a smoke grenade, there is a small hollow chamber extending almost the length of the cannister, thickness of perhaps a Havana and 3 to 4 inches deep or so. Been a long time, anyway he took the blanks we were issued, popped the tops and filled the chamber in the smoke grenades with black powder and resealed the tape. Innovative,nicht wahr? Saw him do it. Thing was......... next patrol we were ambushed. He started hurling these things at the aggressors
Damn! A whole lot of color mixed with black smoke. however there was a tad of concussion mixed in. Some of the guys were deafish for awhile, a few scrapes/scratches. They didn't produce any shrapnel per se, other than the stuff on the ground. I did the aggressor thing later, was always prepared for that. I just know those guys wished to hell they had live rounds at that time.
Did put a nice rip along the side of the cannister though. After a short, very short investigation by the instructors the guy was terminated.