I was an air traffic controller in the Military. On one particular clear, sunny day, a marine helicopter said he was approaching my airfield and requested terminal information. As he got closer, I kept telling him he was not in sight. I finally cleared him for landing and advised him one last time he was not in sight. Then.....silence.
About two minutes later, Osan Airbase control tower called us and asked if we cleared a Cobra gunship to land at our field "not in sight procedures." when I told him yes, they reported that he landed at their airport and immediately took off without contacting them. Doh!
About 5 minutes later, guess who popped up in the left downwind asking for landing instructions? 4951