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Gunnery Sgt. Curtis L. Belfield, Marine Aircraft Group 13 electronic key management system manager, was meritoriously promoted April 4 on the basketball courts near MAG-13 headquarters here. - Gunnery Sgt. Curtis L. Belfield, Marine Aircraft Group 13 electronic key management system manager, was meritoriously promoted April 4 on the basketball courts near MAG-13 headquarters here.