My buddy found these two items on a hunt yesterday, just wanted to get an id and date on them.
button (pin?) is two piece, almost as big as a half dollar
WWII US Army Infantry Belt Buckle and a US Army Collar Disc most likely the same circa, conduct a web image search and an eBay search and you will find them both, cross rifles is always an Infantry symbol.
Why do I know, check out the video I took and posted yesterday: