All patrolmen were assigned individual vehicles in 1937, and over the passing decades, numerous executive, legislative, and administrative changes have occurred since the Patrol's creation. The duties and responsibilities have varied, different ranks have been designated, and the organizational structure has been modified to improve efficiency, to address the needs of the state and in response to changing technology. Examples included an expanded air wing after World War II, implementation of two-way radios, use of helicopters, abolition of fixed-wing aircraft, use of breath testing devices, K-9 dog units, body armor, pursuit vehicles such as Mustangs and Camaros, speed measurement instruments such as the "whammy" in the 1950s, later RADAR, VASCAR and LIDAR and more recently computerized dispatch through in-vehicle terminals.