ABI TRACON CTLR EXPERIENCED LOSS OF SEPARATION DURING C130 FLT BREAK-UP ATTEMPT.

Narrative

2/C130 ILS RWY 16 APCH AT DYESS AFB. I ASSUMED TO BE A FULL STOP. DYESS (DYS) TWR COORDINATED THAT BOTH ACFT WERE REQUESTING PRACTICE APCHS AS INDIVIDUAL ACFT (ACFT X AND ACFT Y). DYS TWR COORDINATED THAT ONE OF THE ACFT WOULD BE ON A 180 DEG HDG (I DON'T RECALL WHICH). NORMAL PROC IS THAT THE FIRST ACFT ON 180 DEGS; AND SECOND RWY HDG. THE ACFT DEPARTED AND THERE WAS A DELAY BEFORE THE ACFT TAGGED PROPERLY. ACFT Y CALLED; I ASSUMED ON A 180 DEG (FIRST) ACFT. I INSTRUCTED THE PLT TO TURN R HDG 270 DEGS AND MAINTAIN 4000 FT. ACFT X CALLED AND HAD NOT TAGGED YET. ACFT Y HAD TAGGED UP AND APPEARED TO BE TURNING W. (ACFT Y TAGGED AS ACFT X.) I REISSUED ACFT Y THE CORRECT CODE. ACFT Y ADVISED ME THAT HE WAS CLBING TO AVOID THE OTHER C130 ON A COLLISION COURSE. THE ACFT PASSED OVER THE OTHER. I AM UNSURE OF THE ALT; LOSS OF VERT SEPARATION; LATERAL SEPARATION AND A LOSS OF DIVERGENCE. I INSTRUCTED ACFT Y TO MAINTAIN 5000 FT. ALL OTHER XMISSIONS WITH ACFT Y WERE NORMAL. ACFT X FINALLY TAGGED UP 8 MI S. I HAD TO INSTRUCT ACFT Y TO TURN N TWICE. I HAD TO CHANGE THE XPONDER CODE FOR ACFT Y. ACFT X ALSO TOOK THIS CODE. CONTRIBUTING FACTORS: TRAINING PLTS; 3 CALL SIGNS; 3 XPONDER CODES; 2 ACFT. TRAINING CTLR. DYESS TWR. LOW EXPERIENCE LEVEL DYS TWR. ASSUMPTIONS ON MY PART. POOR RADAR QUALITY AND PERSECUTION (ONGOING PROB). (ALL THE ABOVE WAS RPTED TO THE SUPVR.)