Looks like a good start to your project!
Newline only display what they have stock of, so the Mongrel range shrinks and grows according to availability.
You could use the Israeli figures too, as a number of Latin American countries bought their kit, including the Galil and their helmet... Honduras springs immediately to mind, but there were others. Obviously the 'US' and 'Pakistani' figures too.
I have some of all of them, but I've been far slower painting them and they are beginning to verbally insult my manhood from the draw I keep them in.