Remember Marcos "heavy" armor? now have a full body image
Marcos loves his armor. Using usual for him, but in some special missions in G5, he needs all the protection available

Also, as i said in another drawing
"For G5 times (2035) Marcos becomed a very experienced military. Depite his unorthodox tactics, skills and personality for a Rupian Soldier, was recognized as a very loyal, trusteable and skilled platoon leader even for the officials that saw him as a "too small, useless, friendly light pile of s***" instead the usual cocky, superb strong and withoit mercy soldier that they wanted. But he showed slowly that his determination compensated great part of the lack of strenght on him, also becoming very popular with his soldiers, being firm and tough but fair and logic. So eventually he was selected to work with the rookies that, as him, doesn´t have the personality and strenght that the Rupians wants BUT have skills to serve to the country. So plus his usual tasks, he also took some classes as instructor, too"

Even without armor, or uniform, and with his normal left arm, Marcos already was great in G4 times ;3