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Я на армейском сенге - пиджак (лейтенант, получивший звание после военной кафедры в гражданском вузе), и в армии не служил, если не считать месячных военных сборов. В основном знаю тему по рассказам...

There are a couple of related jokes :) (I slitly changed them translating):

-Dad, please, let the elephanties run a little bit more.
-Sonny, the elephanties are tired, they ran all day.
-Daddy,...

This is a military slang. When military service lasted 2 years, it was several unofficial ranks for soldiers depending of the time they already served. Запах - before the oath, дух- from oath till...