MLT ON APCH IN IMC HAS NMAC.

Narrative

AN MLT WAS INBOUND TO NAVAL AIR STATION DALLAS; TX; ON THE FINAL LEG OF A 4-LEG MISSION. MLT WAS CLRED FOR THIS APCH; 'CIRCLE TO LAND RWY 17.' BY REGIONAL APCH. COPLT REQUESTED THAT MLT BE GIVEN A GCA PICKUP AT THE HI TACAN RWY 35 FAF AND VECTORS FOR THE CGA TO RWY 17. REGIONAL REPLIED THAT THEY WOULD TRY BUT WERE UNSURE IF THAT WOULD BE POSSIBLE. MLT ROGERED THAT AND STATED THAT THEY WOULD PREFER THE GCA BUT WOULD ACCEPT THE VISUAL IF NECESSARY. REGIONAL THEN SWITCHED MLT TO NBE APCH. MLT REQUESTED A GCA PICKUP FROM NBE APCH AND WAS TOLD TO BREAK OFF THE HI TACAN RWY 35 APCH AT 7 DME (WHEN REACHING 7 DME) AND TURN R TO 020; DSND TO 2000 FT FOR A GCA. MLT EXECUTED THIS CLRNC AT 7 DME. IMMEDIATELY THEREAFTER NBE APCH INFORMED MLT THAT 'REGIONAL ADVISES GCA NOT AVAILABLE;' AIRFIELD IS AT 11 O'CLOCK AND 3 MI; CLRED VISUAL APCH RWY 17. MLT REPLIED THAT THEY WERE IMC AND COULD NOT EXECUTE A VISUAL APCH. AFTER A BRIEF DELAY NBE APCH INSTRUCTED MLT TO CONTACT REGIONAL AGAIN AND FLY HDG 350 DEGS. MLT COMPLIED WITH THE HDG CHANGE BUT BEFORE CONTACT COULD BE MADE MLT RECEIVED A CALL ON GUARD (243.0) TO CONTACT GCA ON 315.6. CONTACT WAS REESTABLISHED WITH NBE GCA ON 315.6 AND MLT WAS TOLD 'TURN L IMMEDIATELY TFC 10 O'CLOCK AND 2 MI.' MLT COMPLIED IMMEDIATELY USING 45 DEG ANGLE OF BANK. AN ALARM WAS HEARD OVER ONE OF THE RADIOS IN THE COCKPIT; ORIGIN UNKNOWN. AN UNEVENTFUL GCA WAS THEN FLOWN TO A FULL STOP AT NBE. DURING THE 45 DEG ANGLE OF BANK TURN THE CREW CHIEF; SITTING IN THE COCKPIT JUMPSEAT; RPTED SEEING AN ACFT PASS UNDER MLT ABOUT 500 FT BELOW. THIS WAS OBVIOUSLY A CTLR COMS PROBLEM. MLT WAS ON ALT AND ON HDG AT ALL TIMES; UNDER POSITIVE IFR CTL. ALL INSTRUCTIONS ISSUED BY CTLRS WERE COMPLIED WITH.