经常造成混淆的是测试阶段的飞机往往被误以为是正式服役的机型。
What was often confusing was that the service-test jets would be mistaken for operational aircraft.
今年春天，海军已经正式取消了禁止女性在潜水艇上服役的禁令。
The Navy officially lifted the ban on women serving aboard submarines in the spring.
现年9岁的比利已服役7年，它的职责是作为吉祥物“带领”整个军营参加各种正式仪式。
Billy, aged 9, was the unit's mascot for 7 years. It usually marched in front of the battalion in all ceremonial duties.
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