Louis, as always, your modeling skills and successes humble me. I cannot even approach the stunning quality of your work, and this latest M113 demonstrates yet more and more. In fact, I sent the link to your M113 build to a friend who was USMC in 'Nam: he replied: "I bookmarked it!"
I hope I show honor and respect to your build with this modest suggestion now that Pavel has taken the lead ("For complete realism I would have stained the "jungles": The guys are clearly not from the barracks.") I would take just a few extra steps on the figures. 
1) I would take the color closest to the skin nearest the eyes and reduce the roundness of the eyes by covering the bottoms and tops of the eyeballs just a bit. These soldiers are in full sun and would practically be squinting.
2) I would next protect all that good painting with a clear flat, lacquer or acrylic.
3) I would use a burnt sienna oil, thinned a great deal settle into the folds in the cloth uniforms, around equipment, and in a thin tint over exposed skin. I would start very light and add slowly allowing drying time between each coat, until the figures look a bit more weathered. 
Step three is a heck of a lot less sophisticated than one can find on YouTube and even demonstrated here on RCTW, but it's my "go to" easy way to add a "veteran" look to figures.
			
			
									
						
										
						1/16 RC M-113A1 ACAV - Converting the Takom/Andy's HHQ kit to RC
- Herr Dr. Professor
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Re: 1/16 RC M-113A1 ACAV - Converting the Takom/Andy's HHQ kit to RC
Unbelievable details!!!
			
			
									
						
							1:16 M2A2 Bradley, M5A1 Stuart, 3D Printed 1/16 M551 Sheridan, MT-LB, 1/18 PBR Mk2
			
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				19Kilo2001
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Re: 1/16 RC M-113A1 ACAV - Converting the Takom/Andy's HHQ kit to RC
Nice work! Do you happen to know the size of the brass tubes you used for the suspension? Thank you