An unarmed Minuteman III test launch took place from Vandenberg Space Force Base early Wednesday morning, the second of the year for the intercontinental

The Air Force conducts regular tests of its Minuteman III ICBMs, as it looks for ways to bring costs under control for the successor Sentinel missile.

Read about the Minuteman III test launch and USAF's program to replace the missile with the LGM-35A Sentinel intercontinental ballistic missile.