Keep the buttons pressed until the mission briefing begins. While the game is loading, hold R1 + R2 + L1 + L2 + Circle + Square. Unpause the game and you will see both air-strike and ion-cannon together. Then press Right, Down, Left(2), Down, Right(2), Down, Left, X, Square, then press Triangle + Circle. One way to make both air-strike and ion-cannon together with just one method, press Start to pause the game.
