three drill sargeants, one from the french foreign legion, 1 from the navy seals and 1 from the sas are on a parade square arguing who´s fighting men are the hardest. after 3 hours they decide to put it to the test.

a lone french soldier walks past.
"you soldier"
"sir yes sir
"pick up your rucksack and run 15 miles up that mountain and be back in 20 minutes"
"sir yes sir"
the soldier was back in 18
"now that is tough says the french drill sargeant.

a lone american soldier walks past.
"you soldier"
"sir yes sir
"pick up your rucksack this french soldier and his rucksack  and run 15 miles up that mountain and be back in 15 minutes"
"sir yes sir"
the soldier was back in 10
"now that is tough says the american drill sargeant.

a lone english soldier ambles past  a pint of beer in one hand and a cigarette in the other.
"you soldier"
"ehh what
"pick up your rucksack, this french soldier and his rucksack and the american and his rucksack and run 15 miles up that mountain and be back in 5 minutes"
"splutter cough F++k Off ye nutter""
Now thats Tough"