NAVAL AMPHIBIOUS BASE CORONADO, Calif. (Sep. 29, 2021) Steelworker 3rd Class Dallas Nichols, member of Amphibious Construction Battalion 1 (ACB 1) Security Organization, inspects a vehicle during a vehicle-borne explosive device drill during ACB 1 Command Post Exercise (CPX) at NAB Coronado, Sep. 29, 2021. CPX is a comprehensive training environment that trains and qualifies ACB 1 in various operational areas. ACB 1 conducts ship-to-shore transportation in support of amphibious operations around the world. (U.S. Navy photo by Mass Communication Specialist 2nd Class Storm Henry)