For the arty guns, there are 4 possible locations, you need to find the correct one, then destroy the guns. The guns is an all or nothing mission, destroy all the guns get the points. For the prototype, fly the 2seater to the designated A/F, kill or suppress the MGs at the field, land the 2seater and taxi to the hangers and stop. After a few moments, the spawn will appear. You can then either preserve the 2seater and fly it back to the 2seater base, or end mission. Take the prototype plane and an icon will appear on the GUI map indicating where to fly the prototype. DO NOT change the ammo loadout of the prototype plane itself