Can anyone help please with these photos?

I’m afraid I am pretty vague on the details but we are sorting out old family photos at the moment and I’d really appreciate any info/suggestions on them at all. I know that the first two are of my Uncle David H. Dewar of Dundee and we believe he was ground crew with the R.A.F. during the second world war. My cousin believed the photos to have been taken in Egypt but that doesn’t seem the right sort of background to me ( I could be wrong of course!). The airman in the third photo I think may be a cousin of my mother called David Horton ( again of Dundee ).

As I said, it’s all very vague but if anyone can help at all it would be fantastic. Thanks.[ATTACH=CONFIG]219820[/ATTACH][ATTACH=CONFIG]219821[/ATTACH][ATTACH=CONFIG]219822[/ATTACH]