These groups enjoyed allied status with the SWA. To have full membership status with the SWA, you must first contact them through their forums, and then be voted in unanimously by their existing members.
These are the names of the SWA's allies:
Based: Spicer Hills, Old Arkham.
Goals: Cold Beer, Orange Whips and Quality Leisure Time.
Based: Wherever we lay our heads at night. Not restricted to the DMZ.
Goals: Real-Time Strikes, meatshielding, reviving.
Based: Foulkes Village
Goals: Revive, defend, rescue, plan, eat cheese.
Based: All over Malton, with a permanent station based in Ruddlebank.
Goals: Research and development, similar to that in Raccoon City.