A B757 CREW; ON APCH TO OMA; WAS UNEASY ABOUT A MIL ACFT THAT WAS CLRED FOR A LOW APCH TO AN INTERSECTING RWY.

Narrative

WE WERE CLRED FOR A VISUAL APCH TO RWY 18 APPROX 15 NM E OF THE FIELD; WHEN ON A 4 NM FINAL TO RWY 18 WE WERE 'CLRED TO LAND' THEN THE TWR CLRED A HVY MIL ACFT FOR A 'LOW APCH TO RWY 14R' (BOTH RWYS CROSS EACH OTHER). AT APPROX 1 NM FINAL ON RWY 18; WE QUERIED THE TWR AS TO THE INTENTIONS OF THE MIL HVY AND WE WERE TOLD HE WAS GOING AROUND. THE MIL HVY DID NOT INITIATE THE GAR UNTIL OVER THE THRESHOLD OF RWY 14R. BECAUSE BOTH ACFT WERE CONVERGING TO THE ARPT; DELAYING THE GAR FOR THE MIL HVY DIMINISHED OPTIONS FOR US. THE TWR SHOULD NOT ALLOW 2 ACFT TO CONVERGE SO CLOSE TO THE GND ON INTERSECTING RWYS. WE HAD GAR OPTIONS; HOWEVER; A POTENTIAL GAR WOULD HAVE BEEN A DRASTIC MANEUVER TO AVOID THE MIL HVY FLT PATH AND WAKE TURB. THE TWR SHOULD HAVE BEEN PROACTIVE AND COMMANDED THE MIL HVY TO EXECUTE A GAR EARLIER TO PREVENT THIS TYPE OF UNNECESSARY LACK OF SEPARATION. THIS WAS DEFINITELY A POTENTIALLY DANGEROUS SIT. ONCE ON THE GND; I CALMLY TALKED TO THE TWR PERSONNEL ABOUT THIS INCIDENT AND HE SAID 'THE MIL HVY WAS LEGAL TO COMMENCE HIS GAR OVER THE THRESHOLD.' I TOLD HIM I WAS UNCOMFORTABLE WITH SUCH A SIT WHILE I WAS ON SHORT FINAL (UNDER 300 FT) SINCE THE TWR DID NOT ACKNOWLEDGE THE POTENTIAL DANGER INVOLVED NOR DID HE SAY THEY WOULD DISCONTINUE THE PRACTICE I AM SUBMITTING THIS NASA RPT.