I spotted the United States Coast Guard while I was walking the Sandtown Trail at the Sequoyah National Wildlife Refuge in Oklahoma. I stop and watch barges that travel up and down the Arkansas River all the time when I am in this area. This was my first time seeing the United States Coast Guard. I read that one of their many roles is the maintenance of river, Intracoastal and offshore aids to navigation. According to the glossary of terms in the United States Coast Guard Light list, an Aid to Navigation (ATON) is any device external to a vessel or aircraft specifically intended to assist navigators in determining their position or safe course, or to warn them of dangers or obstructions to navigation.
After doing some research this looks like a Aids to Navigation Boat which are used to maintain aids to navigation. I also discoverd that nearby Sallisaw, Oklahoma is home to a Shoreside Detachment and its small boat unit and is also homeport for the 75ft Class River Buoy Tender USCGC Muskingum (WLR-75402).
If you look close at the photo to the middle you can make out a group of people.
United States Coast Guard Boat - Sequoyah National Wildlife Refuge - Oklahoma