Sgt. Brendan Campbell, on-the-job trainee, Explosive Ordnance Disposal, places trinitrotoluene around an M107 155mm High Explosive projectile while excavating at Rainbow Canyon Training Area, Oct. 8, 2015. EOD used TNT, C-4 plastic explosives, and an M107 projectile in an attempt to level the ground for the installation of two 2,500 gallon wildlife guzzlers. - Sgt. Brendan Campbell, on-the-job trainee, Explosive Ordnance Disposal, places trinitrotoluene around an M107 155mm High Explosive projectile while excavating at Rainbow Canyon Training Area, Oct. 8, 2015. EOD used TNT, C-4 plastic explosives, and an M107 projectile in an attempt to level the ground for the installation of two 2,500 gallon wildlife guzzlers.