The Advanced Extremely High Frequency (AEHF), is slated to launch in September 2010, and is expected to deliver 10 times the communications bandwidth that is available today for secure and protected communications, according to the GAO. The launch of the first satellite has slipped almost six years. The Pentagon intends to buy three more satellites, bringing the total to six. The fully operational AEHF constellation will offer coverage of the Earth and provide more data throughput and coverage than ever before, says Lockheed Martin, the prime builder of these satellites. The AEHF system is the follow-on to the Pentagon's Milstar highly secure communication satellite program, which currently has a four-satellite operational constellation. The last Milstar satellite was successfully launched in April 2003.