MIL-FGT DESCENDED BELOW ASSIGNED ALT RESULTING IN A NEAR MIDAIR COLLISION WITH ACR-MLG.

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FLYING INTO SAN ON THE CARDI ARR; AFTER GOING OVER TO APCH CTL; WE WERE CLRED TO A SOUTHEASTERLY HDG TO DSND TO 9000' AND SLOW TO 210 KTS. ON A CONSTANT HDG AND DSNDING CLOSED THROTTLES AND SLOWING; I CALLED TFC AT 1 O'CLOCK; NBND. A FEW SECS LATER HE STOPPED TURNING AND APPEARED TO BE COMING AT US; BUT WITH ADEQUATE VERT SEP. THE TARGET APPEARED AS A SINGLE RED BEACON. THE F/O SAID HE COULD NOT SEE THE TARGET. I RESPONDED WITH; 'HE'S BEHIND YOUR WINDSHIELD POST.' THE F/O NOW SPOTTED THE TFC. A FEW SECS LATER THE VERT SEP DIMINISHED RAPIDLY. I CALLED TO THE F/O TO 'PUSH IT DOWN.' HE RESPONDED AND THE MIL ACFT PASSED OVER US. VISUAL VERT SEP DID NOT APPEAR CRITICAL (IN THE DARK); BUT I COULD HEAR HIS ENGS. THIS PROMPTED ME TO ASK APCH ABOUT THE TFC. HE SAID THAT IT WAS A MIL JET RETURNING TO MIRAMAR CLRED TO 15000'. ON THE GND THE WATCH SUPVR SAID THE MIL JET WAS INDICATING 325 KTS AND WAS AT 14100' AND WE WERE AT 13700'. THE MIL JET HAD SOME 'HUNG ORDINANCE' AND WAS RETURNING TO BASE UNDER EMER CONDITIONS.