201019-N-WS871-1011 SANTA RITA, Guam (October 19, 2020) Electronics Technician 2nd Class Ian M. Tuck assigned to Naval Mobile Construction Battalion (NMCB) 133 det. Guam conducts a high frequency (HF) communications check over voice with Marine Wing Communications Squadron 18 (MWCS-18) during NMCB 133’s joint communications exercise (COMMEX). During the exercise ET2 Tuck conducted voice and data communication checks with NMCB 3 Det. Japan, MWCS-18, Marine Air Support Squadron 2 (MASS-2), and Marine Air Control Squadron 4 (MACS-4) stationed on Okinawa, Japan. (U.S. Navy photo by Chief Electronics Technician Joshua J. Clower)