The swarm launcher is a fire-and-forget salvo launcher. The militia variant is no different in this aspect.
However, the militia swarm launcher is bulkier and thereby uses more PG and CPU. Furthermore, it has a smaller ammo capacity coupled with weaker missiles and less capabilities as other variants, resulting in its low meta-level. Although there are better anti-vehicle weapons in DUST, the militia variant is perfectly acceptable as a starter weapon against vehicles.