Thanks for the update, Ken, and as always thank your grandson for his service. My oldest son did AD "A" school on jets (F-14 squadron in Japan), then later a "B" school on turbo-props and helo's (MH53 Sea Dragon Minesweepers - 3 turbo-shaft engines, Frisco to Corpus). He opted out after ~nine years, got his A&P card and is now the director of aircraft maintenance for Garmin. Military tech training is good training!