The first one is a Masonic medallion, I do not see any military connection. It might have some value to a member of that lodge but it would not be worth more than a few dollars otherwise. I was able to find a
source for the Army challenge coin, but oddly enough it was from a private Chinese minter

And I also found another one on [eBayitem]140529325659[/eBayitem]. As far as military challenge coins go, it is a fairly basic example. Some of the fancier ones are solid brass or bronze with colored enamel such as
this one.