Why don't planes have rear mounted missiles?

[Maelstrom]

Why use a missile?

Missiles have a lot of problems that dumb launch proximity burst weapons wouldn't have.

Design the weapon so that it's supposed to bounce eratically in the jet wash. Instead of launching one, launch many. Have them set on timers to arm, so that the proximity sensor does not target the launch plane. Rather than a powerful explosive, though that could work, have them act as shrapnel weapons.

Wonder what 1500 ball bearings traveling at supersonic speeds would do to the underside of atmospheric flight platforms?

Have to agree with the posters above, though, it's not likely to be used that often.

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