SGT. Jason F. Ruff, foreground, and STAFF SGT. Mark K. Lauer train under simulated combat conditions to learn ground defense techniques during Exercise Volant Scorpion. The men, both members of the 3rd Mobile Aerial Port Squadron, are preparing for situations during which their squadron will have to set up airport facilities for Air Force air wings while under enemy attack. Ruff and Lauer are armed with M-16 carbines, equipped with blank firing devices