In U.S. terminology, it is about equivalent to an "oak leaf cluster", signifying additional awards of a medal. DocL
Don't forget the Davy Crockett......
Like everyone else has said, 20mm would be about the closest. As far as I can tell, no-one ever used an 18mm round. However, I guess it could be...
The unit is probably 13th Depot Supply Squadron. ASAC is "Air Service Area Command". This type of unit controlled depots groups and other...
To continue this discussion, there is a "carbine" clasp for the marksmanship medals. Buten42 is right-- if the man had qualified with the...