From the 'grenade' type badge I'm guessing It's a fusilier regiment, (although some others such as the Honourable Artillery Company also used a 'grenade' type badge).
Too poor a quality picture for positive ID though.
From looking at the picture on their site I can't see the similarity, (apart from the style of monument, but that's fairly standard), the monument's too small, and there's no hedgerow in the background of Keon's pic).
Unless someone's got a photo from a similar view I don't think this can be positively IDed without the key who posted it saying where he thinks it's from.
I think I somehow got sidetracked..
I've just discovered that right-clicking on Koens original pic brings up the caption '10-Amerikaans-kerkhof-in-Ieper.jpg', which I presume means Ypres, so there's no reason to disbelieve the caption is there?
So I think we can all congratulate ourselves on having solved the mystery, namely the pic shows the graves of 10 Americans in a Ypres war cemetery!
No that's the problem, that style of cross is fairly common, as for it being in ypres, quite possible, but there are numerous military cemeteries in the Ypres area.
Still don't think it is an American cemetery though. Could be 10 American graves in a British or mixed cemetery, as going back to the original question, the nearest headstone looks like a Fusilier.