Army National Guard to conduct training exercises at NTRA Herald Democrat Military training will return to North Texas Regional Airport — Perrin Field, albeit for one night. The Grayson County Regional Mobility Authority announced Thursday that members of the Texas National Guard will conduct a training exercise at the former air base on March 19. NTRA Airport Manager Mike Livezey said he was approached by members of the 143rd Infantry Regiment of the Texas National Guard about possible training exercises about two months ago. "It has been confirmed that they want to do a training exercise here at the airport," Livezey said. "They've done this in the past."