The Navy added "Naval" to MCB creating the NMCBs that now exist. During that year the 30th Naval Construction Regiment had five battalions in the Da Nang area and two at Chu Lai. The 32nd NCR had three battalions tasked near Phu Bai and one at Dong Ha. In May 1968 two reserve battalions RNMCB 12 and 22 were activated, bring the total number of battalions in Vietnam to 21. Both ACBs were in theater as well as Construction Battalion Maintenance Units (CBMUs) 301 and 302. In 1968 NMCB 10 had an unusual "tasking" supporting the 101st Airborne. During 1969 the Seabees deployed topped out at 29,000, from there their draw-down began