A WDB MIL CHARTER MADE AN APCH TO THE WRONG ARPT.

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I WAS THE CAPT ON MUL CHARTER FLT FROM PRESTWICK SCOTLAND TO FORBES AIR BASE AT TOPEKA; KS. WE DEPARTED PIK AT HA13Z ON 10/MON/92 AND LANDED AT FOE AT HA34Z. THE LAST 400 PLUS MI OF OUR FLT WE WERE CLRED INS DIRECT TO FORBES. THE DSCNT WAS UNDER CTL OF ZKC. THE WX WAS RPTED AS CLR WITH TEMPS 49 DEG/33; WIND 170/15 HOWEVER; HORIZ VISIBILITY WAS NOT AVAILABLE UNTIL BELOW 5000 FT (5000 FT OVCST). OUR CLRNC WAS TO 3000 FT. THE SECOND TIME CTR ASKED US IF WE HAD THE ARPT; TO COPLT RESPONDED BY SAYING 'WE HAVE AN ARPT AT (APPROX) 11 O'CLOCK. CTR THEN CLRED US FOR A VISUAL APCH. I DID NOT THINK THIS WAS THE CORRECT ARPT. THE COPLT AND SO THOUGHT IT WAS THE CORRECT ARPT. I PROCEEDED TOWARD THIS ARPT. AT THIS TIME THE WORKLOAD WAS HVY WITH LNDG PREPARATIONS AS WELL AS TRYING TO DETERMINE IF THIS WAS THE CORRECT ARPT. DUE TO CTR FREQ CONGESTION; WE WERE UNABLE TO OBTAIN ANY HELP FROM ZKC. OUR PRIMARY RESOURCE WAS A FAXED COPY OF THE FORBES ARPT DEPICTION WHICH WAS VERY SIMILAR TO BILLARD MUNICIPAL ARPT. AS WE GOT CLOSER AND ON AN EXTENDED CTRLINE; IT BECAME OBVIOUS THAT THIS ARPT WAS MUCH SMALLER AND A GAR WAS COMMENCED. AT THIS TIME; CTR SWITCHED US TO FORBES TWR WHO IMMEDIATELY ADVISED US OF THE WRONG ARPT. I CLBED TO 3000 FT; MADE A R TURN DIRECTLY INTO A BASE LEG AT FORBES AND MADE AN UNEVENTFUL LNDG. CONTRIBUTING FACTORS: NO HELP FROM ZKC (NO RADAR VECTOR OR RADIAL AND DISTANCE TO FORBES). NO USABLE NAVAIDS AT THE ARPT (ADF 4.5 NM SE -- TOPEKA VOR 11.5 NM NE) POORLY FAXED COPIES OF COMPANY SUPPLIED CHARTS (1 COPY OF ARPT DEPICTION; VOR DME-21; VOR DME-3; NDB-31. NO KANSAS CITY AREA CHART). PROBABLY SOME DEG OF CREW FATIGUE AFTER 8 1/2 HR TRANSATLANTIC FLT AND 11TH DAY OF OUR TRIP.