F-18 MIL PLT HAS DIFFICULTY IN OBTAINING ZKC CTLR TO UNDERSTAND PLT CLRNC REQUEST.

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I WAS CRUISING AT FL280; SW OF FAM VORTAC; ENRTE TO STL. AT A POINT APPROX 25 NM SW OF FAM; I REQUESTED A R TURN DIRECT TO THE CAPE GIRARDEAU ARPT; AND REQUESTED TO DSND BELOW CLASS A AIRSPACE IN ORDER TO CANCEL IFR AND PROCEED TO CAPE GIRARDEAU VFR TO WORK THEIR PATTERN AND THEN TO STL VFR IN ACCORDANCE WITH MY COMPANY'S LOA WITH ZKC FOR THE OP OF HIGH PERFORMANCE; JET ACFT. THE ZKC CTLR APPROVED MY REQUEST AND VECTORED ME IN A R TURN DIRECT TO THE CAPE GIRARDEAU ARPT; AND GAVE ME A DSCNT TO FL240. I VACATED AND RPTED VACATING FL280 FOR FL240. AT THAT POINT; THE CTLR APPEARED TO GET CONFUSED AND CLRED ME TO CAPE GIRARDEAU VIA FAM AND STL; WHICH WAS NOT POSSIBLE OR PRACTICABLE. AFTER REPEATING MY REQUEST TO PROCEED DIRECT TO CAPE GIRARDEAU AND DSND BELOW CLASS A AIRSPACE TO CANCEL IFR; SHE BECAME CONFUSED AGAIN AND CLRED ME TO CAPE GIRARDEAU VISUAL STL. I AGAIN REPEATED MY REQUEST TO DSND BELOW CLASS A AND CANCEL MY IFR FLT PLAN TO STL AND PROCEED VFR. THE CTLR THEN APPEARED TO UNDERSTAND MY REQUEST AND CLRED TO 17000 FT MSL AND TO RPT CANCELING. I RPTED VACATING FL240 AND RPTED BELOW FL180; AND CANCELLED MY IFR FLT PLAN. I PROCEEDED TO CAPE GIRARDEAU; AND AFTER 2 TOUCH-AND-GO PRACTICE LNDGS; PROCEEDED TO STL WITHOUT INCIDENT; COMPLYING WITH LCL COURSE RULES.