SMA ON SEARCH AND RESCUE MISSION ASSIGNED A SQUAWK CODE WHICH IS LATER ASSIGNED TO ANOTHER ACFT AS WELL. PLT ENTERS RESTR AREA WITHOUT PROPER CLRNC.

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I FLEW A CIVIL AIR PATROL MISSION IN THE EGLIN RESERVATION. I CONTACTED ATC ON THE GND AT FIELD #2 PRIOR TO TKOF. (ON THE NEW ORLEANS SECTIONAL IT IS CALLED EGLIN TEST SITE C3.) I TOLD ATC THAT I WANTED TO SEARCH AN AREA N OF FORT WALTON BEACH AND HURLBURT FIELD. I WAS NOT TOLD OF ANY PROBS WITH MY REQUEST AND WAS GIVEN A SQUAWK CODE. THEY KNEW THAT I WOULD BE IN RESTR AIRSPACE. I DEPARTED AND FLEW S IN THE CORRIDOR TO THE COASTLINE. I SWITCHED TO UNICOM AND RPTED THAT I WAS TRANSITIONING BY DEST ARPT; THEN ONE PROB AROSE. ANOTHER CIVIL AIR PATROL ACFT DEPARTED THE SAME FIELD ABOUT 15 MINS AFTER I DID; AND I HEARD HIM CONTACT ATC. THE PROB WAS THAT ATC GAVE HIM THE SAME SQUAWK CODE THAT I HAD. I REALIZE NOW THAT I PROBABLY SHOULD HAVE TOLD ATC ABOUT THE MISTAKE; BUT I THOUGHT THAT ATC WOULD SURELY FIND THE MISTAKE AND CORRECT HIS SQUAWK CODE. I CONTINUED ALONG THE COAST AND SWITCHED TO HURLBURT TWR FOR TRANSITION. ONCE CLR OF HURLBURT I SWITCHED BACK TO ATC. I THEN WENT N AND ENTERED R-2915B; AND WAS NEVER TOLD NOT TO ENTER RESTR AIRSPACE. ATC KNEW THAT I WOULD BE THERE; FOR 20 MINS EARLIER I HAD TOLD THEM. I WENT FURTHER N AND ENTERED R- 2915A. I FLEW AND SEARCHED FOR ABOUT 15 MINS. ATC THEN ANNOUNCED OVER THE RADIO FOR THE ACFT WITH MY SQUAWK CODE TO CALL THEM. ATC OBVIOUSLY LOST ME DUE TO THE SQUAWK CODE ERROR. I CALLED ATC AND THEY TOLD ME TO FLY E; IMMEDIATELY TO DEPART RESTR AIRSPACE. THE NEXT TIME I TALKED TO ATC IT WAS A DIFFERENT CTLR. THE LAST ONE WAS OBVIOUSLY REPLACED BECAUSE OF THE MISTAKE. THE BIGGEST PROB WAS THE SQUAWK CODE MISTAKE AND THE FACT THAT IT WAS ALSO A VERY BUSY DAY. I FEEL ATC WAS RESPONSIBLE BECAUSE THEY KNEW THAT I WOULD BE IN RESTR AIRSPACE. WHAT I WILL DO DIFFERENT NEXT TIME IS TO MAKE ABSOLUTELY SURE THAT I AM CLRED INTO RESTR AIRSPACE. WE ARE ALL HUMAN HERE AND ARE GOING TO MAKE MISTAKES.