VX-31 Dust Devils Patch Aviators! Are you looking for a high-quality patch you'll proudly wear or display? Look no further than the VX-31 Patch! 4" patch Embroidered US Naval Aviator Owned Business Hook and Loop Air Test and Evaluation Squadron 31 (VX-31 or AIRTEVRON THREE ONE, commonly referred to by its nickname, The Dust Devils) is a United States Navy air test and evaluation squadron based at Naval Air Weapons Station China Lake, California. Using the tail code DD, they fly numerous United States Navy and United States Marine Corps fixed-wing aircraft and helicopters. This squadron was highlighted when worn by Maverick.