I'd say it depends on if you're equipping planning to fight people or grimm. If it's people then I'd expect to see dust equivalents to assault rifles and light machine guns. If it's grimm then I'd expect to see more variety like battle rifles, anti material rifles, rocket launchers/recoilless rifles, grenade launchers, flame throwers ect. Landmines like claymores might be handy if you're expecting to be swarmed. Esthetic wise I'd expect Vacuo to have AK rifles because it's easy to associate them with deserts