SAS poetry

Just wondering around on wikipedia.org i found some fun stuff about the SAS, amungst others this littel poem

If you can read a map and find your way
And trust your compass and follow where it may
If you can trust yourself when we all doubt you
And make allowance for our doubting too

If you can walk and not be tired by walking
Or being lost and late don't deal in lies
Or when silent give way to talking
Not talk too big or talk too wise

If you can hump a Bergen nor mind the weight
And care for it though it was your life
If you can fight alone yet basha with a mate
And work with him yet never come to strife

If you can force your heart and nerve and sinew
To serve your turn long after they have gone
And so hold on when there is nothing left in you
Except the will which says hold on

If you can walk with troggs yet keep your virtue
Or walk with brass nor lose the common touch
If neither us or Pen - y - Fan deter you
If all men count with you but none too much

If you can fill the unforgiving minute
With sixty seconds of distance run
Yours are the wings and everything that's with it
And which is more - you're SAS my son