FLT OF 2 FGT HAD NMAC WITH SMA WHILE OPERATING ON MIL VR ROUTE.

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WE WERE A 2 SHIP OF FGT X FLYING A PUBLISHED MIL TRNING LOW LEVEL ROUTE; VR 1642. WE WERE STRIVING TO MAINTAIN 500' AGL AND 420 KTS GND SPD. THESE ROUTES ARE SCHEDULED IN ADVANCE. FLT SVC IS NOTIFIED AND WE TALKED WITH TERRE HAUTE FSS PRIOR TO ENTERING THE ROUTE TO ADVISE THEM. THEY TOLD ME LATER THAT THEY PUBLISH NOTAMS ABOUT THE TRNING ACTIVITIES AND ALSO XMIT ON ALL VOR'S WHEN THE ROUTE IS ACTIVATED. THE BACK SEATER WAS DOING THE NAV SO MY ATTN WAS COMPLETELY OUTSIDE THE ACFT. WE WERE BOTH LOOKING TO THE RIGHT SIDE OF THE ACFT TO SEE OUR COURSE REF TO THE TOWN OF MONON; IN. WHEN I LOOKED TO THE LEFT I SAW COPTER Y SLIGHTLY BELOW US AT 10 O'CLOCK. HE WAS HDG E; WE WERE 043 DEGS. THERE WAS NO TIME TO TAKE EVASIVE ACTION. THE ONLY REASON WE MISSED WAS BECAUSE WE WEREN'T ON A COLLISION COURSE. MY WINGMAN SAW HIM AT THE SAME TIME WE DID. HE SAID THE HELI WAS STILL FLYING AFTER WE PASSED SO OUR JETWASH DIDN'T HURT HIM. WE MISSED BY 20-30'. I THANK GOD THAT I'M STILL HERE TO RPT THIS! AN AIR FORCE FORM 651 HAS ALSO BEEN FILED.