BackworldTraveller
SOC-13
Any population that feels itself threatened and surrounded and outnumbered can easily find itself feeling that it needs such a military reserve. Balkanised planets could easily have a cold-war atmosphere - but a cluster with a series of balkanised worlds, each including inter-world colonies from across many shared worlds wouldn't be too dissimilar to earth's colonial models...and that would almost never result in militarisation!??!