File:MSA (Marco) MSA win.gif MSA (Marco) is a playable unit in Metal Slug Attack, first appearing in the Extra Ops "Power of new versions" (as a pre-acquisition unit, obtained by purchasing 10,000 medals). He is currently available in the Medal/VIP Crank. If File:MSA Skill small +.png 4 is unlocked, Marco automatically rides MS-Alice as soon as he is deployed.