what does "flunked out of the army" mean?

[hanakusa]

English Language Tests, Intermediate level

ESL/EFL Test #470 "English Slang Idioms (212)", question 2

"That boy is no good. He didn't finish school, he ......... out of the army and he got fired twice in the past five months. Can't you find another guy to date?" Logan asked his daughter.

(a) jumped
(b) fired
(c) rose
(d) flunked

English Language Tests, Intermediate level

ESL/EFL Test #470 "English Slang Idioms (212)", answer 2

"That boy is no good. He didn't finish school, he flunked out of the army and he got fired twice in the past five months. Can't you find another guy to date?" Logan asked his daughter.

Correct answer: (d) flunked

Your answer was: incorrect
"That boy is no good. He didn't finish school, he jumped out of the army and he got fired twice in the past five months. Can't you find another guy to date?" Logan asked his daughter.
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what does it mean by "flunked out of the army " ?

hanakusa

[Linda]

Hi,
If someone flunked out of something (like school, the army etc.), that means he/she failed. In other words, he/she did not succeed and could no longer finish the course etc.
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[Skrej]

Also, the Army is sometimes perceived or portrayed as being full of very dumb people, often with no skills to do any other job, which is why they joined the military. So to say they flunked out of of the Army means they can't even follow simple specific directions.

Since the military is a highly structured society, this could also imply that the person has problems adhering to regulations and rules, or problems with authority.