The USAF brass are dreaming about space war again. Having (mostly) rejected the idea of just destroying enemy satellites, the new plan is to hijack their steering systems, using a “parasitic attitude control system,” or PACS. This little gremlin will attach itself to the target, and either run it out of fuel (rendering it useless), thrash it around until bits drop off, realign it for use by friendly forces or move it for safe destruction or capture.