The United States Ambassador to Islamabad Cameron Munter has said that Washington is complying with Pakistans demand to vacate an air base that has been used by American drones. Pakistan gave the US until Dec. 11 to vacate Shamsi air base in southwest Baluchistan province after NATO air-strikes killed 24 Pakistani soldiers. "I think what we can promise you is that we will do everything we can to vacate the Shamsi base by the date that you asked us," said Munter. Ambassador Cameron Munter said in an interview with local TV on Monday that the U.S. is doing everything it can to vacate Shamsi by the deadline. The move is not expected to significantly curtail US drone attacks in Pakistan since the base was only used to service drones that had mechanical or weather difficulties. The US does not publicly acknowledge the drone program in Pakistan. But American officials have said privately that the strikes have killed many militants. Munter said that US is probing Nato hit and Pakistan will be kept informed of outcomes.