 This enabled American aircraft to bomb North Vietnam and Laos at night, and in all types of weather, an operation code-named Commando Club.Despite US efforts to maintain the secrecy of the installation, which included "sheep-dipping" of the airmen involved, US operations at the facility did not escape the attention of the PAVN and Pathet Lao forces.Toward the end of 1967, PAVN units increased the tempo of their operations around Phou Pha Thi, and by 1968 several attacks were launched against Lima Site 85.