Col. Christopher C. Seymour, former commander of Marine Aircraft Group 26, thanks the Marines of his command for their hard work and dedication after his last flight, July 31. Seymour began his service as MAG-26 commander in May 2011 and is stepping down Friday, Aug. 2. - Col. Christopher C. Seymour, former commander of Marine Aircraft Group 26, thanks the Marines of his command for their hard work and dedication after his last flight, July 31. Seymour began his service as MAG-26 commander in May 2011 and is stepping down Friday, Aug. 2.