From the days of the earliest human conflicts to modern warfare, gaining the high ground over an enemy has offered a huge tactical advantage. Whether from a hill, castle, or warplane, the ability to attack from above has often ensured success. Many people fear that space is the next high ground, as countries race to place weapons and defense satellites into orbit. Some may be designed only to knock out enemy missiles, while others may launch attacks upon targets on Earth or in space. Philip Wolny explores one of the most secretive corners of military planning to report on the current status and likely future of weapons satellites.