US Marine Ped Models

Hey, recently I started working on some old school US Army peds for IV (Cold War 1980s and post Cold War 1990s), using some of the peds of IV, which fits good, since ain't got more realistic models. I have planned, mixing ped meshes to create also female and white soldiers, and if it's possible add something as ammo puches and pistol holder (taken from the regular cops).

So far I've got a soldier with a field jacket (it was a default GTA IV model I edited the texture), and another one with flak jacket and undershirt. That one I have to change the pants to the same that has the ped with the field jacket, which have boots. Also I'll change the boots color to black, like the old jungle boots.

However, I'm having some issues, as you can see here, it also happens with the swat helmet, so please, if you have ped mixing knowledge I'd greatly appreciate if you could help me. or make the favour of mixing the ped meshes. If you can, please PM me.