The Tulsa District U.S. Army Corps of Engineers navigation maintenance vessel Captain and crew stand in front of their boat, Mr. Pat, near Sallisaw, Oklahoma, June 15, 2016. Mr. Pat was christened and put into service at the District on June 28, 1996, and for the past 20 years has been instrumental in the facilitation of maintenance along the Tulsa District's portion of the McClellan-Kerr Arkansas River Navigation System. (U.S. Army Corps of Engineers photo by Preston Chasteen/Released)