Captian Kelly Youngblood, speaks to a lock & dam operator as the Tulsa District U.S. Army Corps of Engineers navigation maintenance vessel, Mr. Pat, travels across Robert S. Kerr Lake on the McClellan-Kerr Arkansas River Navigation System to perform maintenance at Lock and Dam 15, near Sallisaw, Oklahoma, June 15, 2016. Mr. Pat was christened and put into service at the District on June 28, 1996, and for more than 20 years has been instrumental in the facilitation of maintenance along the Tulsa District's portion of the MKARNS. (U.S. Army Corps of Engineers photo by Preston Chasteen/Released)