MOP is GPS guided, with control fins. It can be rolled out the back of any cargo aircraft that can lift it to drop altitude and still score a precision hit.
You have a great Fourth too!
When dropping a munition there is the “Ballistic Release Point” (BRP. This point is a finite distance from where a bomb is dropped and free-falls ballistically to the target. That distance can be visualized by thinking of the target as the center of a circle and the BRP distance is the radius.
Now, when it comes to guided free-fall munitions, the BRP does not work. You see, when a guided munition falls and those fins move for guidance that action induces drag and move the munition, corrects its flight path, thereby bleeding off it kinetic energy and the weapon falls short and sometimes (often) bleeds off enough energy the munition lands off-axis and broaches.
Consequently, the release point for a free-fall GUIDED munition is closer to the target, the radius is smaller. This release point is called the “Optimal Release Point” (ORP).
When the free-fall guided munition like the MOP is released, the objective is to impact the target at a specific axis, speed and angle.
Axis because you want the most effective entry-point to be struck, to burrow down at the most effective vector/direction.
Airspeed means kinetic energy. Don't want too much otherwise the casing will fracture upon impact and the blast effect (if it goes off) will be reduced. The reverse is true if dropped with too little energy. The window between the two is narrow and small and you need precise aiming cues and release data and kicking a bomb out the back simply won't work.
Angle of impact is critical when it comes to hitting the target to ensure the penetrating capability is assured and fusing functions properly.
Therefore, as you can see, just kicking it out the back simply does not work.
Cheers.