Perimeter Action Group 5 (also known as PA Group 5) was a Starfleet battle force extant in the late 23rd century. (Ships of the Star Fleet, vol. 2)
PA Group 5 consisted of USS Biisk, USS Bril, USS Ancylus, USS Aversa and other vessels. In the early 2290s, the group was homeported at Starbase 21.
- Perimeter action groups may have been the counterpart of what were called pursuit groups in other continuities.