To earn the patch you'll have to visit and learn about all three National Park units in the state of Oklahoma: The Oklahoma City National Memorial, the Chickasaw National Recreation Area, and the Washita Battlefield National Historic Site.
If you live in Oklahoma or are planning to visit, first get an Oklahoma Outdoor Ranger booklet. You can download it here, or pick one up when you visit one of the parks. In addition to the patch, you'll also receive a certificate as an Oklahoma Junior Ranger. Remember… as a Junior Ranger you EXPLORE – LEARN- and PROTECT wherever you go. Good luck!