B737-300 CREW OVERSHOT THE LOC ON RWY 11L AT TUS; AFTER THE CAPT DID NOT ARM THE LOC FOR AN AUTOPLT CAPTURE.

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I WAS PNF AND WE WERE ON THE DINGO 5 ARR TO TUS. IT WAS VFR. THE CAPT FLEW THE BEGINNING OF THE ARR PROPERLY; BUT DID NOT ARM THE 'LOC' BUTTON AND FLEW THROUGH FINAL. ON THE DINGO 5; A 75 DEG HDG FROM MAVVA PUTS YOU ON THE ILS APCH COURSE. AFTER FLYING THROUGH THE FINAL APCH COURSE HE SAID; 'THERE ARE 2 ARPTS OUT HERE; ASK HER IF WE'RE CLRED FOR THE APCH.' I THEN REALIZED THAT HE WAS HEADING TOWARD DAVIS-MONTHAN AFB AND HADN'T TRANSTIONED. I ASKED APCH IF WE WERE CLRED FOR THE APCH AND SHE REMARKED; 'IF YOU CALL THE ARPT IN SIGHT.' I ASKED THE CAPT IF HE HAD THE ARPT IN SIGHT AND HE REPLIED; 'YES.' WE THEN TURNED 90 DEGS TO ABOUT A 170 DEG HDG AND REJOINED THE APCH CLOSE TO THE ARPT. THE CAPT SAID; 'SHE WAS SUPPOSED TO CLR US FOR THE APCH!' I TRIED TO EXPLAIN THAT WE WERE EXPECTED TO JOIN FINAL FROM THE HDG; BUT I DIDN'T CONVINCE HIM. LOOKING BACK; I BELIEVE HE WAS READING THE INSTRUCTIONS FOR RWY 29R (NOT THE ACTIVE; RWY 11L) WHERE ONE GETS VECTORS FROM MAVVA AND IS MOST OFTEN FLOWN. I ALSO BELIEVE HE WAS HEADING FOR THE MIL BASE; SINCE IT WAS VERY WELL LIT. I DIDN'T HAVE TUS IN SIGHT; I WAS EXPECTING TO SEE IT ONCE WE WERE ESTABLISHED. I DO NOT BELIEVE HE HAD IT IN SIGHT UNTIL AFTER WE WERE WELL PAST COURSE. WE WERE CERTAINLY MI OFF OUR ARR; I CAN'T EVEN ESTIMATE HOW MANY SINCE WE REMAINED ON THE 075 DEG HDG THROUGH FULL-SCALE DEFLECTION ON THE ILS AND CONTINUED. I FELT WE WERE VERY CLOSE TO THE AFB BY THE TIME WE TURNED; BUT IT WAS A CLR NIGHT AND HOPEFULLY I WAS WRONG. NEITHER APCH NOR TWR MENTIONED ANYTHING; SO PERHAPS NO HARM NO FOUL. I LEARNED THAT JUST BECAUSE I UNDERSTAND AN ARR DOESN'T MEAN THE GUY SITTING NEXT TO ME DOES; AND I HAVE TO KEEP A VIGILANT EYE ON WHAT IS SELECTED/NOT SELECTED (IN THIS CASE; THE 'LOC' BUTTON) AND THE CDI; EVEN IN PERFECTLY CLR; VFR WX. I DID NOT HAVE THE ARPT IN SIGHT; I WAS TRUSTING THAT IF WE REMAINED ON THE ARR; I WOULD SEE IT. HAD WE REMAINED ON THE ARR; I IMAGINE I WOULD HAVE BEEN CORRECT. BUT I SHOULD HAVE CAUGHT THE MISTAKE. TO TOP OFF A PERFECT DAY; AT THE GATE (WE WERE USING 'GATE SVCS' WHERE WE DON'T START THE APU; BUT LEAVE AN ENG RUNNING UNTIL GND PWR IS CONNECTED) THE CAPT; THROUGH HABIT; CUT BOTH ENGS BEFORE WAITING FOR GND PWR; PLUNGING THE AIRPLANE INTO EMER LIGHTING CONFUSION/DARKNESS FOR ABOUT 20 SECONDS.