I try to avoid a pattern, a lot of it is based on the adjacent bases and accessing a least one base farther away. I try to give Air Bases 4 spawns in, with one spawn out adjacent to town. Vehicle Bases have 3 spawns in with 2 spawns our locally. Same with Ports, 3 spawns in with 2 spawns out locally, however there are no spawns out of the ports to any other base. All bases are limited to a maximum of 8 spawns out, with a theoretical unlimited amount of spawns in.