The AGM-86C CALCM differs from the AGM-86B air launched cruise missile in that it carries a conventional blast/fragmentation payload rather than a nuclear payload and employs a GPS aided INS.

air-launched cruise missile. It is harder to detect, and has greater range and accuracy than the AGM-86 air-launched cruise missile. The ACM achieves maximum range through its highly efficient ...

The test is performed every five to 10 years to demonstrate the capability of the B-52 to provide the required voltage levels for the mission configuration in the AGM ... 86 air-launched cruise ...