[quote=@vietmyke] Yes, the artillery cannons would be a reduced to a direct fire weapon while in space. Also, your friend is right and wrong. 20mm and 30mm [i]are[/i] WW2 gun calibers, but they are also modern day calibers too, such as the 25mm and 30mm autocannons used on American IFVs such as the Bradley. Also, keep in mind that a MAS is primarily an 'evolution' of Aerospace fighters, not tanks. Current standard calibers for aircraft cannons are 20 and 30mm- both of which are designed to penetrate armor, which they do rather well. Keep in mind that weapons in this time are also magnetic/mass driven weapons, not propellant driven weapons. Ballistic weapons in this age have begun trading mass for acceleration, as well as more advanced metallurgic and explosive technologies that have no doubt been developed by this point in time. A 120mm round would be acceptable for a heavy/long range rifle weapon, not a rapid fire autocannon. [/quote] On that note, how do we compare to conventional armor on the ground? While our automatic autocannons may not be overly effective, I'm curious how our bigger guns and armor compare.