Star Trek Expanded Universe

Perimeter Action Group 52 (also known as PA Group 52) was a Starfleet battle force extant in the late 23rd century. (Ships of the Star Fleet, vol. 2)

PA Group 52 consisted of USS Ameer, USS Acavus, USS Bendraze and other vessels. In the early 2290s, the group was homeported at Starbase 7.

Perimeter action groups may have been the counterpart of what were called pursuit groups in other continuities.