PA28 PRIVATE PLT FAILED TO OBTAIN XPONDER CODE PRIOR TO VFR FLT PLAN CROSS COUNTRY RETURNED FLT RESULTING IN MIL FIGHTER ACFT MONITORING HIS RETURN FLT TO RPTR'S PROPOSED DEST.

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I FILED VFR FLT PLAN WITH HNL FSS BY PHONE. I USUALLY WALK IN; BUT ON THIS OCCASION THEIR BLDG WAS BARRICADED AND I HAD TO CALL. I FILED DIRECT TO LANAI; 'ISLAND RPTING' (FREQUENT CHK POINTS CALLED IN) WITH A DELAY AT LANAI; THEN A RETURN FLT COUNTER CLOCKWISE AROUND LANAI; THEN DIRECT BACK TO HNL. I WAS GIVEN A TRANSPONDER CODE (BY CLRNC; NOT FSS) TO LANAI AND FSS TOLD ME TO CALL ON 135.4 FOR RETURN CODE. THE FLT TO LANAI WAS UNEVENTFUL EXCEPT THAT I PASSED 2 OTHER ACFT (WITH DEP CTL ASSISTANCE) WHICH WAS UNUSUAL. THE FIRST ONE WAS SOON AFTER TAKEOFF; THE OTHER SEVERAL MINS LATER LEAVING LANAI AT MY PROPOSED TIME OF XA00 I ACTIVATED FLT PLAN WITH FSS ON 122.2 AND ATTEMPTED TO CALL ON 135.4 FOR NEW XPONDER CODE; BUT COULDN'T HEAR THEM. I CONTINUED TO CALL (WITH XPONDER CODE 1200); BUT NO LUCK SO I CALLED FSS AGAIN AND ASKED THEM TO RELAY CODE; WHICH THEY DID SHORTLY; ALSO ADVISING ME THAT I SHOULD NOT HAVE TAKEN OFF WITHOUT A CODE. SOON AFTER I WAS INTERCEPTED BY F16 FLYING ON MY L AND TURNING IN FRONT OF ME. I MANEUVERED TO AVOID HIS TURB. MEANWHILE; I CONTINUED UNDER CTL AND F16 STAYED NEARBY MAKING BIG CIRCLES AS HE WAS FASTER. I PROCEEDED ROUTINELY AND LANDED NORMALLY. I THINK THIS ALL COULD HAVE BEEN AVOIDED IF A FACE TO FACE BRIEFING (AS I USUALLY GET) COULD HAVE OCCURRED. I SEE NO GOOD REASON FOR THE FSS BEING BARRICADED FOR WALK-INS; WHICH WOULD HAVE PROVIDED A LOOK AT NOTAMS AND WX CHARTS/IMAGERY; BOTH LACKING ON PHONE BRIEFING. I CALLED FSS A FEW DAYS LATER AND ASKED WHAT THEIR PROCEDURES WERE AND WAS TOLD THAT FSS WOULD PROVIDE TRANS CODE ON THEIR 800 PHONE NUMBER. THIS WAS NOT THE CASE; OR WAS NOT TOLD ME ON MY FLT. WHILE UNDERSTANDING THE NEED FOR AIR SECURITY; IT'S NOT CLR HOW HAVING A XPONDER CODE WOULD HELP. ANYONE CAN GET ONE BY PHONE; OR A TRUE CRIMINAL WOULD FLY LOW AND NOT USE A XPONDER. FINAL THOUGHT: IS THIS ANOTHER FAA ATTEMPT TO CURTAIL GA? PART 135 OPS WERE FLYING BEFORE; US; EXCEPT FOR IFR.