In all reality... No. There's a reason military forces have men armed with guns, not swords. I can understand the viewpoint of 'AW HELZ YEH LAZR SORDS', being viable, but it still doesn't make much sense when that sword-toting mech can easily be gunned down before they get within 50 yards...

(I'm assuming Armored Core is a video game, in which swords would be blatantly OP, similar to the knives in CoD, because they would otherwise be useless)