Vietnam to 21. Both ACBs were in theater as well as CBMUs 301 and 302. In 1968, NMCB 10 drew an atypical Seabee "task" supporting the 101st Airborne. It happened again in 1969 when CBs 10, 40 and 121 sent EOs to Fire base Fury. During 1969 the number of Seabees in theater reached 29,000, from there their draw-down began. The last battalion withdrew late 1971 with the last Seabee teams out a year later. When it was over they had sent 137 Seabee teams, built 15 CB camps, and deployed 22 battalions. CBMU 302 became the largest CB ever at over 1400 men and was homeported at Cam Rahn Bay. On 23 April 1975 it was announced that U.S. involvement in Vietnam was over. That day CB 4 started construction of a temporary camp for Operation New Life on Guam. In seven days 2,000 squad tents were erected and numbered 3,500 when done. During Vietnam the Seabees had a few uniform variations. One was the stenciling of unit numbers across the back of the field jacket M-65. Another was the collar and cover devices for enlisted E4-E6. The Navy authorized that the "crow" be replaced by the rating insignia of each trade. Nametags were another, they started out white with a multicolored seabee. In 1968, the USMC OD green pattern was copied. The NAVCATs became the only Seabees to ever be authorized to wear a shoulder patch. NAVCATs Naval Construction Action Teams CBMU 302 had 23 NAVCATS(Naval Construction Action Teams) total with 15 the most active at one time. Teams were numbered 1-23. They were Vice Admiral Elmo Zumwalt's expansion of the Seabee Team concept. He submitted it in November 1968 to General Creighton Abrams commander of Military Assistance Command, Vietnam. Agent Orange Many Seabees were exposed to the defoliant herbicide while in Vietnam. NCBC Gulfport was the largest storage depot in the United States for agent orange. From there it was shipped to Vietnam. In 1968, the NCBC received 68,000 barrels to forward. Long term barrel storage began in 1969. That lasted until 1977. The site covered 30 acres and was still being cleaned up in 2013. Space race: NASA/Tektite I In 1960, a MCB 10 detachment built a Project Mercury telemetry and ground instrumentation station on Canton island. On 28 January 1969 a detachment of 50 men from Amphibious Construction Battalion 2 plus 17 Seabee divers began