master gunnery sergeant
noun/ˌmɑːstə ˈɡʌnəri sɑːdʒənt/
/ˌmæstər ˈɡʌnəri sɑːrdʒənt/
- an officer of middle rank in the US marines
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master gunnery sergeant
Definition of master gunnery sergeant noun from the Oxford Advanced Learner's Dictionary