The memorial depicted above is located at this veterans' cemetery, and is dedicated to a US submarine lost with all hands during World War Two. I do not know that the submarine had any connection with Wyoming, and finding the memorial there was a bit of a surprise.
This bridge crosses the North Platte River just below the cemetery, and has a series of memorials on the north side, which can be seen here and in the photographs below. The bridge is very near where Richards Bridge, a pioneer bridge with a trading post and an Army outpost, was located in the 19th Century.
Updated.
The following photographs were taken on May 23, 2015, when this cemetery was decorated for Memorial Day, 2015.