Enemy infiltrators between opertion battles

[bluehand]

One theory with the sniper is maybe he was out of ammo and in an area that didn't get enough ammo reload. being a sniper with no ammo the game may have just sent him home.
also the game seems to combine units. so a infantry unit may disapear in the idea that they are now manning your howitzer that lost half its crew. having a sniper work at gunner wouldn't be too bad.