Hello Jazz and thanks for your question.
It is quite hard to give you a direct answer to your question as there are over 200 jobs in the Army, many of them are fully committed to the front lines and some are only partially commit.
To help you out as best as I can, please check the link below which gives you 7 categories that the roles of the Army are placed into.
Combat is classed as the front line but don't ignore this category as there will be some roles that aren't directly front line.
https://apply.army.mod.uk/what-we-offer/army-life/career-streams
Once you are happy, then check out the role finder to see what you would like to do (link below).
https://apply.army.mod.uk/roles
I hope this helps you with your question, and good luck.
-Danny.
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