Whether it's 'jackspeak' or just good old-fashioned slang the British Armed Forces have a whole language and military terminology unto themselves.
A lot of these historic phrases like 'chew the fat' and 'long shot' have entered everyday English, however much of these phrases might perplex the average 'civvy'.
We've put together a quiz featuring some of the best-known phrase and some of the more obscure terminology in the forces.
So why not 'fill your boots' and have a go for yourself?
Once you have aced the test below don't forget to share your scores on social media and tag us in once you've finished so we can find out how well you've done.