The Martian War of 2304 spanned two systems, three years, four factions, and headed off five generations of bad blood. While waged from the peak of technological complexity between the most complex and expensive pieces of machinery ever constructed by human hands, it was fought not through starfleets and airforces, wet navies and armored columns, but through old-fashioned manpower - boots on the ground.
Be it the Terran Frontiersmen falling upon Olympia, the Jaegers of Mars facing the moonfall, or the Colonial Marines of the HDF staring down the Stormtroopers of Jupiter, for every warship, fighter jet, and tank, there will always be generations of men and women fighting war the way it's been fought since man could throw rocks.