noun [ U ]
1.
a period during which young people train in the armed forces :
to be called up for military service
She has to do her military service .
2.
the time sb spends in the armed forces :
He's completed 30 years of active military service.
noun [ U ]
1.
a period during which young people train in the armed forces :
to be called up for military service
She has to do her military service .
2.
the time sb spends in the armed forces :
He's completed 30 years of active military service.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005