Atlantic fleet CBs. Naval Mobile Construction Battalion 1 Naval Mobile Construction Battalion 11 Naval Mobile Construction Battalion 133 NCF Reserve From the 1960s through 1991, reserve battalions were designated as "Reserve Naval Mobile Construction Battalions" (RNMCBs). After 1991 "Reserve" was dropped with the integration of reserve units within the NCF making all battalions NMCBs Naval Mobile Construction Battalion 14, HQ Gulfport, MS. detachments in five states and Puerto Rico. Naval Mobile Construction Battalion 18, HQ Port Hueneme, CA., detachments in six states and Guam. Naval Mobile Construction Battalion 22, HQ Port Hueneme, CA. detachments in five states. Naval Mobile Construction Battalion 25, HQ Port Hueneme, CA. detachments in six states. Naval Mobile Construction Battalion 27, HQ Gulfport, MS. detachments in seven states. Detachment: A construction crew that is "detached" from the battalion's "main body" deployment site. The size is determined by the project scale and timeline. Battalion: The battalion is the basic NCF unit with a HQ Company plus four Construction Companies: A, B, C, & D. CBs are organized to function as independent self sufficient units. Regiment: Naval Construction Regiments (NCRs) provide a higher echelon command to three or four CBs operating on close proximity. Naval Construction Groups 1 and 2: In 2013, Seabee Readiness Groups (SRGs) were decommissioned, and re-organized as NCG-1 and NCG-2. They are regimental-level command groups tasked with administrative and operational control of CBs, as well as conducting pre deployment training for all assigned units. NCG-2 is based at CBC Gulfport while NCG-1 is at CBC Port Hueneme. Seabee Engineer Reconnaissance Team (SERTs) SERTs are the Special operations capable element of the NCF developed by the First Naval Construction Division (1st NCD) in Operation Iraqi Freedom. They are intended to provide engineering assessments in the field in support of the United States Marine Corps Reconnaissance Battalions. A team has two CEC officers and eight enlisted Seabees, augmented by additional personnel as needed. A team has three elements: liaison, security, and reconnaissance. The liaison (LNO) element has an officer and two communications specialists responsible for communicating the assessments and intelligence. Reconnaissance has the other officer, who is the Officer-in-Charge (OIC), a BU or SW cpo with bridge construction experience. The team has a corpsman or medically trained member, the remainder are selected for being the most qualified in their trade. All are required to have the Seabee Warfare pin. In 2013, 1st Naval Construction Division along