Star Trek Expanded Universe

Perimeter Action Group 41 (also known as PA Group 41) was a Starfleet battle force extant in the late 23rd century. (Ships of the Star Fleet, vol. 2)

PA Group 41 consisted of USS Kuril, USS Sandusky and other vessels. In the early 2290s, the group was homeported at Star Station Yalta.

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