The invasion was lasting longer than expected, and the Marines needed some plywood to weatherproof their headquarters. A sergeant and three good men were sent out with a 6x6 truck to steal the plywood from the nearby Army base. All was going well, they had found some plywood and loaded it on their truck, when two MPs drove up in a jeep, demanding to know what was going on.
This was clearly one of those critical moments when the success of the mission was at stake. It was up to the sergeant to apply all his long experience of military matters. "Oh," he said, thinking quickly, "we were looking for somewhere to dump this scrap plywood."
"Well, you're not dumping it here," the MP replied, "take your truck and your plywood and get off this base."