SHORTLY AFTER DEPARTING PNS; AN MD88 CREW RECEIVED A TFC ALERT AND SPOT A NAVY T34 IN AN ACROBATIC MANEUVER VERY CLOSE TO THEIR FLT PATH. THE CREW CALLED THE FAC AND FILED A NMAC RPT.

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PREFLT AND TAXI WERE NORMAL; AND DEP WAS AT XA:45L FROM RWY 17 AT KPNS. FO WAS THE PLT FLYING. DEP CTL VECTORED US FIRST TO THE E AND THEN FURTHER L TO A HEADING OF 020. DURING THE TURN; ATC DIRECTED US TO STOP THE CLB AND LEVEL AT 7000 FT DUE TO VFR TFC AT 7500 FT AND AT 7800 FT. BOTH THE FO AND I LOCATED ONE OF THE ACFT; WHICH WAS A T-34 AT OUR 11 O'CLOCK POS. THE T-34 APPEARED TO BE AT THE TOP OF A LOOP BEGINNING A DOWNWARD PULL IN OUR DIRECTION. THE FO STOPPED THE TURN IN AN ATTEMPT TO MAINTAIN THE SEPARATION BTWN US. AT ABOUT THE SAME TIME; WE GOT A RESOLUTION ALERT ON TCAS INSTRUCTING REDUCED CLB. WE LEVELED AT 6000 FT AND WE RECEIVED NO FURTHER TCAS ADVISORIES. THE T-34; HOWEVER; CONTINUED TO PULL DOWNWARD DIRECTLY TOWARD US AND PASSED WITHIN WHAT APPEARED TO BE APPROX 100 FT OFF OUR TAIL. I CALLED IN THE NEAR MISS TO ATC; AND INFORMED THEM WE WOULD BE FILING A RPT UPON LNDG. I THEN CALLED THE AFT FLT ATTENDANT STATION TO INFORM THEM AND TO SEE IF ANY PAX WERE VOICING CONCERNS AFTER OBSERVING THE INCIDENT. I WAS TOLD THAT THERE DID NOT APPEAR TO BE ANY CONCERN AT THAT TIME AMONG THE PAX; BUT LATER A NUMBER OF THEM MENTIONED THE EVENT AND COMMENTED ON THE CLOSE PASSAGE OF THE OTHER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT ATC ISSUED CTL INSTRUCTIONS TO SEPARATE THEIR MD88 FROM THE T34. AFTER THE RPTR ADVISED THAT HE WOULD BE FILING AN NMAC; ANOTHER UNIDENTIFIED VOICE XMITTED ON THE FREQ; 'IT HAPPENS EVERY DAY.' THE RPTR STATED THAT DURING THE FAC CALLBACK; THE P31 SUPVR TOLD HIM THEIR PRELIMINARY INVESTIGATION INDICATED THAT THE T34 HAD EXITED ITS RESTRED AIRSPACE WITHOUT A CLRNC.