used to form the 121st CB. Due to Seabees being given advanced rank upon enlistment, enlisted Marines referred to construction battalions as "sergeant's battalions". USMC sergeants do not pull guard duty, so the ranked Seabees would not be assigned. The NCOs of the 18th wore USMC chevrons and not USN "crows" on their uniforms. USN insignia on USMC issue. Seabees were shore party for the Marines on Bougainville, Peleliu, Guam, Purata Island, Roi-Namur, Saipan, Iwo Jima, and Okinawa. The Marines deployed them as combat engineers at Cape Gloucester, Tarawa, and Tinian. The first Marines assigned to a CB were attached to CBD 1010 on Guam. The 2nd Separate Marine Engineer Battalion was next, assigned to the 27th NCR with two former USMC CBs; the 25th and the 53rd. In mid-August 1944 the 1st Separate Marine Engineer Battalion was assigned to the 30th NCR. Prior, 100 Marines were assigned to the 71st CB on Bougainville. NCDUs, Seabees outside the NCF NCDUs at Normandy: 11, 22–30, 41–46, 127–8, 130-42 The Joint Army Navy Experimental Testing (JANET) site for beach obstacle removal, Project DM-361, was located at the ex-Seabee base, Camp Bradford after the NCDU program moved. 14 NCDUs were combined to create UDT 9, almost completely Seabees NCDUs 200 – 216 were combined to create UDT 15. Presidential Unit Citation USN/USMC : Naval Combat Demolition Force O on Omaha beach at Normandy. Navy Unit Commendation: Naval Combat Demolition Force U on Utah beach at Normandy. UDTs, Seabees outside the NCF The Naval Special Warfare Command building at the U.S.N. Seal base at Fort Pierce is named for Ltjg. Frank Kaine CEC commander of NCDU 2. General Donovan the head of the OSS approached General MacArthur and Admiral Nimitz about using OSS men in the Pacific with Europe invaded. Gen. MacArthur had no interest. Adm. Nimitz looked at Donovan's list and also said no, except he could use the swimmers from the Maritime Unit. He was only interested in them for being swimmers not being OSS. Seabees outside the NCF, made naval history. Admiral Turner recommended over 60 Silver Stars and over 300 Bronze Stars with Vs for the Seabees and other service members of UDTs 1-7 That was unpresendented in USN/USMC history. For UDTs 5 and 7 at Tinian and UDTs 3 and 4 at Guam, all officers received a silver stars and all enlisted received bronze stars with Vs. Adm. Conolly