I think the minimum obligation in the British Army is also four years for enlisted. For officers is similar (might be three). IIRC rightly officers can join on a short service commission (minimum commitment) then switch to a longer term contract once they're in. There are get out opportunities for all ranks during training but once your training is complete you're committed.
IIRC the maximum term for enlisted in the British Army is usually 22 years. To carry on beyond that I think you need to get promoted to either Warrant Officer or Late Entry Officer (a scheme that promotes long serving NCO's to Commissioned Officers at the end of their enlisted service).
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Author of the unofficial and strictly non canon Alternative Survivor's Guide to the United Kingdom
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