Reduce the heavy ammo for machine guns in iron banner holy shit! I'm so tired of people holding onto that heavy for 10 kills. It's to the point where I'm honored to die by a rocket. I'm just like "oh you got me with a rocket? Alright I can't even get mad". With machine gun death, "yup that's the same guy that killed me 5 minutes ago with a machine gun"
To those that are saying get rid of it: if you don't like heavy then pick it up but don't use it. Pretty simple choice that doesn't rain on everyone else's parade.
Or just play Inferno.
Give it a 20 second timer on heavy. You have 20 seconds to use your heavy ammo after those 20 seconds the ammo disappears, even if you haven't used it or still have ammo left