Keywords: US Navy 070821-N-8547M-017 Builder 3rd Class James W. Strait, of Naval Mobile Construction Battalion (NMCB) 5, drinks through his protective mask during a chemical, biological and radiological protection drill in field exercise.jpg en FORT HUNTER LIGGETT Calif Aug 21 2007 - Builder 3rd Class James W Strait of Naval Mobile Construction Battalion NMCB 5 uses the drinking tube on his protective mask during a chemical biological and radiological protection drill in field exercise Operation Bearing Duel 6-07 Naval Construction Force battalions conduct such exercises annually to ensure that they are ready to be deployed U S Navy photo by Mass Communication Specialist 3rd Class Patrick W Mullen III RELEASED 2007-08-21 070821-N-8547M-017 Navy http //www navy mil/view_image asp id 50486 U S Navy photo by Mass Communication Specialist 3rd Class Patrick W Mullen III PD-USGov-Military-Navy Fort Hunter Liggett Builder United States Navy Operation Bearing Duel 2007 Males wearing gas masks M40 Field Protective Mask |