awards for heroism. Teams were sent to other nations as well. The Royal Thai government requested STATs in 1963 and ever since the Seabees have continued to deploy teams. Construction Civic Action Details or CCAD CCADs or "See-Kads" are larger civic action units of 20–25 Seabees with the same purpose as Seabee Teams. The CCAD designation is not found in the record prior to 2013. Camp David Camp David is officially known as Naval Support Facility Thurmont, as it is technically a military installation. The base is staffed by the CEC, Seabees, and Marines. "In the early 1950s, Seabee BUs, UTs and CEs took over routine maintenance of the base and additional rates were added for administrative functions. Today Seabees still man the base public works and see that the grounds are in an impeccable condition." "Selectees undergo a single scope background investigation to determine if they qualify for a Top Secret Sensitive Yankee White (YW) clearance. All personnel in Presidential support activities are required a "Yankee White" security clearance. The tour lasts 36 months." When the base has a larger construction project a Construction Battalion from the fleet can be tasked. NMCBs 5 and 133 have drawn these assignments. Antarctica: Science Operation Highjump In December 1946, 166 Seabees sailed from Port Hueneme on the USS Yancey and USS Merrick assigned to Operation Highjump. They were part of Admiral Richard E. Byrd's Antarctic expedition. The U.S. Navy was in charge with "Classified" orders "to do all it could to establish a basis for a (U.S.) land claim in Antarctica". The Navy sent the Seabees to do the job starting with the construction of Little America (exploration base) IV as well as a runway for aerial mapping flights. This Operation was vastly larger than IGY Operation Deep Freeze that followed. Operation Deep Freeze In 1955, Seabees were assigned to Operation Deep Freeze making Antarctica an annual deployment site. Their task was the construction and maintenance of scientific bases for the National Science Foundation. The first "wintering over" crew included 200 Seabees. They cleared an ice runway at Mcmurdo for the advance party of Deep Freeze II to fly to South Pole Station. MCB 1 was assigned for Deep Freeze II. Antarctica added to the Seabee's list of accomplishments: Tractor train traverses covering hundreds of miles. Bases built: McMurdo Station, South Pole Station, Byrd Station, Palmer Station, Siple Station, Ellsworth Station, Brockton