Glossary entry (derived from question below)
Jan 31, 2013 05:42
11 yrs ago
English term
BRN
English
Other
Military / Defense
the abbreviation BRN
Commander XY (BRA)
Change log
Jan 31, 2013 13:05: NancyLynn changed "Term asked" from "BRA " to "BRN" , "Field (write-in)" from "the abbreviation BRA " to "the abbreviation BRN"
Responses
4 hrs
Selected
Bahraini Royal Navy
My confidence here is based on the fact that, according to you're profile, you are in the Persian Gulf:
"Commander-in-Chief of the Bahrain Defense Force (BDF) Field Marshal Shaikh Khalifa bin Ahmed Al Khalifa met in his office this morning with Brigadier General Shaikh Khalifa bin Abdullah Al Khalifa on the occasion of the latter's appointment as Acting Commander of the Bahraini Royal Navy (BRN)."
http://www.bna.bh/portal/en/news/505721
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Note added at 10 hrs (2013-01-31 15:47:02 GMT)
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Sorry for the error in line 1 above: it should be "your profile", of course.
"Commander-in-Chief of the Bahrain Defense Force (BDF) Field Marshal Shaikh Khalifa bin Ahmed Al Khalifa met in his office this morning with Brigadier General Shaikh Khalifa bin Abdullah Al Khalifa on the occasion of the latter's appointment as Acting Commander of the Bahraini Royal Navy (BRN)."
http://www.bna.bh/portal/en/news/505721
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Note added at 10 hrs (2013-01-31 15:47:02 GMT)
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Sorry for the error in line 1 above: it should be "your profile", of course.
4 KudoZ points awarded for this answer.
9 hrs
Ioanna Karamanou
United States
United States
Native in English
&
English
Works in field
United States
Native in: English 
, Greek
Works in: Greek to English, English to Greek, English, and 5 more.
Baloch Republican Army (BRA)
It's hard to focus a search without more context, but the top hits on Google for " BRA commander" led me to this. Hope it fits your context.
Discussion
Please allow me a personal opinion without infringement of the site rules: I really *dislike* opening a KudOz question and not able to find a whole sentence or description!
But if it's a country, BRN coud mean Brunei.
Is it in a list?
What immediately springs to my mind is an abbreviation for the country Brazil, (is this part of a list of names followed by country abbreviations?), but without more context impossible to know.