A Sniper Team in a Partisan Bolt Action army represents anything from an untrained civilian out for revenge on the occupiers to a seasoned hunter that has decided to join the resistance.
Like most weapons used by the partisans, light mortars were often captured examples and short of ammunition. Light mortars were also relatively easy to supply by airdrops. For most partisans, mortars were too precious a resource to waste, and they were usually saved for just the right moment to surprise the enemy and pin them down as fighters advanced towards their targets.