Well...
I'm doing the ww1 module right now and actually, none of the recruitment poems seem to be very good - as in they don't come across as good, worthy 'literature'.
So your poem fits in with the genre very well in that it covers the aspects of bravery, comradeship and patriotism et al.
A few points. Your rhythm is all over the place, these lines need to either scan (a good one for reference is 'Who's for the game' by Jessie Pope) or you could try a mixture of free verse and rhyme which you can find in 'Comrades : An Episode' by Robert Nichols. The latter would be easier to pull of if you've problems with scanscion as you can chop and change with line lengths, end-rhyme, enjambement etc and you won't end up with cringeworthy lines like this: "And tell you're children to France you've been".
What else... bits that just don't fit in with the ww1 timeline: "the same, old scene?" just doesn't ring true as a phrase that would have been used circa 1914. "Its quite an experience and pretty good pay," this comes across as either sarcastic or just strange. Would a recruitment poem really have said this, especially as the average recruit (not officer level) was paid less than an unskilled worker?
I think you've got the right idea, you just don't have the belief in the subject matter combined with technical skill, so it doesn't come off. Also, this poem is quite unoriginal. I know you're probably going for the 'typical' recruitment poem but there is no 'wow' here. A war poem that is absolutely exceptional (in my opinion) is 'What the bullet sang' by Francis Bret Harte, so you might look to that for inspiration and to get out of the idea of the traditional (and thus generic) war poem.