Now that brings back a memory. While driving on the taxiways going to the radar unit on the AF base where I was stationed, I ended up following a big black truck and trailer. There was a large sign on the back. Couldn't read it so I got closer. Still couldn't read it, got closer. All of a sudden I was cut-off by a jeep and had 2 m16's pointing at me. The third SP comes over and I show my ID and TS clearance card. He asked why I didn't stay back 1000 ft as the sign said. Hell, I said I was trying to read the damn sign. The letter on the sign were only 3 1/2 inches! (I checked later)