Given for "Exemplary Conduct". The class "A" pass allows the holder to be absent from his organization when not on duty. Probably only the squared away, GI soldiers would have one.
Printed on White Card Stock
The most common temporary pass. This was the pass issued for a standard two or three day pass. If you were heading off base for a visit into town, you would have this on you.
Often these were kept as souvenirs of a particularly good time! ;^)
Printed on plain white paper.