Laurence,
Well spotted. I think you are right - they look like 17s. There are also some more Il-28s scattered around, plus what look like tank berms.
The US and Russian aircraft at Tan Son Nhat that you refer to have now gone, the US ones after 35 years of sitting there corroding away! One of them, a Chinook, showed up earlier this year, in my backyard, figuratively speaking. My apartment overlooks the War Museum, and it is now there, having been repainted and generally spruced up.
Gainesy,
The gent on the left is wearing Yemeni tribal garb, which often includes a jacket. I presume the jacket must have been a relatively recent addition to the traditional clothes.