军事学
(美陆军、海军陆战队的)军士长；上士
These are sergeants first class, majors, lieutenant colonels, folks with 10 to 20 years of service in the Army.
NPR: U.S. Turns More Attention to Training Iraqi Forces
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。