Hi.
Ok. To start, the Mexican Army doesn't have MBT, it only has light armoured vehicles. Right now I would consider the ERC-90 Lynx our ''main battle tank.'' We have a variation of modified wheeled armored vehicles and some track armored vehicles.
The armored vehicles that appear in the pictures are russian BTR-80 APC .
The Navy Secretariat (including Naval Air and Marines) has buy russian technology in the last couple of years. Recently, they received 50 URAL trucks, and a couple of more Mi-17s. They are planing to buy Mi-24 HIND from Russia.
The Navy Secretariat main assault rifle is the M16A1/A2, and they are not planing to replace it. The National Defense Secretariat is the one that is going to replace the G3 for the G36 modern assault rifle.The National Defense Secretariat (including Army and Air Force) and
Navy Secretariat (including Naval Air and Marines) are totally independent from each other , each one receives their own budget and they decide what to buy.
As aditional information. The mx marines were using onother uniform similar to the woodland . Im not sure if they are still using it. You can see it in one of the pictures above.
saludos.