Those are three of the four figures from set USP1, the 82nd Airborne Command set. Here is a quote from the book about them:
"Set USP1 consisted of four figures: an officer standing with binoculars to his eyes in his right hand an M1 rifle in his left hand, a sergeant with a pistol in his hand, a tommy gun hanging from a strap, signaling with his other hand, one standing “Tommy gunner” and one sitting radio operator with one leg extended out to the side. The figures from both USP sets wore light green uniforms with the American Flag hand painted on one shoulder and the “All American” Division double “A” patch on the other, and American pattern helmets. They are very “toyish” in overall appearance, having been “inspired” by Airfix figures. The set originally retailed for $51."
