USAF Tech School, about 1984. Fantastic hands on labs. Also showed the use of the "current tracer", which was real cool. But I have never used one since. The

USAF Tech School, about 1984. Fantastic hands on labs. Also showed the use of the "current tracer", which was real cool. But I have never used one since. There was a wand that would sense current, and there was a device that you could touch to a PCB trace and it would inject a signal. With the current tracer, you could see the current disappear when it was shorted to ground by a bad PCB trace.