I think that anyone short of an expert will have a hard time answering more than one or two of these questions. But we've got some experts here!Let's see how folks do, or if I've come up with a stumper. :-)

I'm showing the wreaths on the reverses of four different US medals. Three of these I've had for a while; the fourth one is a new purchase. And ajaw-dropper of a purchase also - but for reasons that are not exactly related to this challenge and that I'll reveal afterwards. For now, give this ashot:

1. Besides obvious trivial details (They're all round! They're all silver! They all have wreaths on them!), what do the four medals have in common?[difficult]

2. Identify each medal:
* A (30.5 mm): [difficult]
* B (30.5 mm): [expert-plus]
* C (36.1 mm): [expert]
* D (36.1 mm): [expert-plus]