These tiny injuries are not consistent with B-40 rocket shrapnel. THEY ARE CONSISTENT WITH THE EFFECTS FROM M-79 GRENADE LAUNCHERS. ... He probably then grabbed the M-79 grenade launcher -- shooting a round into a reportedly monsoon rain. The round would have detonated prematurely due to the wall of rain that was coming down and thus blown back to wound Thorson and Kerry, as well as Fred Short it appears.