DENISON, Texas — Tommy Holder (left), and Josh Wingfield, both Park Rangers with the U.S. Army Corps of Engineers Tulsa District, along with Student Conservation Association intern Matt Mueller pose with a group of children who have learned about water safety at Lake Texoma. The Tulsa District has teamed with Wendy's to "ticket" children "caught" wearing life jackets. Each ticket is good for a free Frosty.