During Naval Mobile Construction Battalion (NMCB) 133’s Black Hell Squad competition, Builder Chief Chris Locke gives NMCB 133 Seabees instruction on the chemical, biological, radiological donning procedures and time limits during the command’s Black Hell Squad competition. Seabees had nine seconds to don their gas masks and nine minutes to properly don their CBR gear and modular tactical vest.

Photo by: Cliff Williams |  VIRIN: 151005-N-EW956-007.jpg