From Avalon Hill FAQ
Wehrmacht Expert Sniper says,
“Crack Shot — This unit gets +1 on each attack die.
Superior Camouflage — While this unit has cover, enemy units can’t attack this unit at medium or long range.
Headshot — Once per game, instead of attacking a Vehicle, you may roll six attack dice. If you roll three or more successes, put a face-up Disrupted counter on that Vehicle. This counter isn’t removed at the beginning of the next casualty phase.â€
Q: Does the Crack Shot ability apply to Headshot?
A: Yes. The Crack Shot ability modifies attack dice, so the Wehrmacht Expert Sniper rolls successes on a 3 or higher.
Q: Does “have cover†mean that the Sniper has to succeed at a cover roll to get the Superior Camouflage ability?
A: No. A unit “has cover†just by being in hex filled with defensive terrain. This means that a Sniper with Superior Camouflage can’t be attacked directly at medium or long range while it’s in a forest, hill, marsh, or town hex.