CL65 ON DSCNT FOR TUS EXPERIENCED TCASII RA WITH HELI.

Narrative

VMC ON WHAT APPEARED TO BE A VECTOR TO A L BASE FOR RWY 11L AT TUS THAT CROSSED THE FINAL FOR RWY 11 AT DAVIS MONTHAN FIELD; CA; (A MIL FIELD). WE WERE TOLD TO LOOK FOR A BEECHJET ON FINAL FOR RWY 11L AT TUS; AND TO DSND AND MAINTAIN 5000 FT ON A 240 DEG HDG; NOTICED TCASII WAS INDICATING TFC AT 11 O'CLOCK POS; INSIDE OF 5 MI AT 5000 FT MSL. THIS TURNED INTO A TA THEN QUICKLY AN RA. SIMULTANEOUSLY COMPLIED WITH RA AND SPOTTED A BLACKHAWK HELI WBOUND AT 5000 FT MSL INSIDE A MI. THE FO ADVISED THE APCH CTLR AND WERE IMMEDIATELY CLRED THE VISUAL TO RWY 11L AT TUS. I GOT ON THE RADIO AND TOLD THE CTLR THAT THIS WAS THE CLOSEST I HAD EVER BEEN WITH AN RA. HE MERELY SAID THAT HE DID NOT KNOW WHAT THE HELI WAS DOING AT THAT HE WAS SUPPOSED TO BE ON A DIFFERENT HEADING. ON THE GND I CONTACTED THE GND CTLR FOR THE APCH CTLR'S PHONE NUMBER. IN CONCLUSION; I FEEL THERE WAS A LACK FO SITUATIONAL AWARENESS WITH APCH CTL AND BLACKHAWK HELI. DISMAYED THAT I WAS UNDER APCH CTL THEN IMMEDIATELY DUMPED TO A VISUAL BY THE CTLR WHEN RA WAS RPTED.