RCW 37 refers to a section of the Revised Code of Washington, which is a compilation of all permanent laws in the state of Washington. This code includes various statutes that govern different aspects of state law, including civil, criminal, and administrative regulations. Specifically, RCW 37 deals with matters related to military affairs and veterans. It outlines the rights and benefits available to service members and their families, as well as the responsibilities of the state in supporting these individuals.