Animating the Missile Turret

First, I selected the first turret and set Missile Raise/Lower at a value of 0 on frame 76 of the timeline. Then I set the value to 5 at frame 83. To add a recoil to the turret opening, I set the raise/lower value to 4.8 on frame 84, then back to 5 at frame 86. I then Shift-selected the last three frames and put them closer to frame 76 on the timeline, speeding up the animation.