WHILE ON VISUAL APCH TO RAP ARPT; ACR MAY HAVE PENETRATED ADJACENT MIL ARPT (RCA) ARPT TRAFFIC AREA.

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DUE TO THE PROX OF 2 ARPTS; RAPID CITY REGIONAL AND ELLSWORTH AFB; THE ATA'S ARE SPLIT. THE BOUNDARY USED IS A RIDGE OF HILLS BETWEEN US; UNDISCERNABLE AT NIGHT. RAPID CITY HAS NO RADAR. THE ONLY PROCEDURE IN WRITING IS A MEMO FROM RAPID CITY TWR CHIEF STATING 'IF ACFT EVEN APPEAR TO ENTER THE TCA ATA; COORDINATE WITH THEIR TWR.' THIS ACFT DID NOT APPEAR TO BE ENTERING THEIR ATA; CONTRARY TO A REPORT HE HAD DONE SO BY THE ELLSWORTH RADAR APCH CTLR. ACR X WAS ON A LEFT BASE FOR RWY 14 AT RAPID CITY APPARENTLY HAD TFC DEPARTING RWY 13 AT THE AFB IN SIGHT; PREVIOUSLY ISSUED TO HIM BY APCH. WITHOUT THE AID OF RADAR IN THE CAB; NIGHT PERCEPTION APPARENTLY CONTRIBUTED TO THIS ERROR. ADDITIONALLY; THE PLT HAD BEEN CLRD FOR A VISUAL APCH; CLRD TO LAND ON INITIAL CONTACT WITH TWR AND I BELIEVE HE IS REQUIRED TO AVOID ENTERING ANOTHER ATA ONCE RADAR IS NO LONGER PROVIDED. RADAR SERVICE WAS TERMINATED BY APCH AND HE WAS INFORMED OF SUCH. I BELIEVE TO PREVENT THIS FROM RECURRING; A NEW PROCEDURE NEEDS TO BE IMPLEMENTED. POSSIBLY HAVING APCH CTL TO CONTINUE FLT FOLLOWING AND ADVISE US IF THERE'S A CONFLICT; POSSIBLY NOTAM ACTION; POSSIBLY OBTAINING RADAR AT RAPID CITY. THE RIDGE LINE ITSELF IS NOT ADEQUATELY LIT TO PROVIDE THE PLT OR CTLR PROPER REFERENCE FOR AIRSPACE MATTERS.