INSTRUCTOR AND INSTRUCTOR UNDER TRAINING IN THE FRONT SEAT REPORT ALTITUDE DEVIATION ON GO-AROUND WHILE WAITING FOR WING MAN TO REJOIN. INSTRUCTOR UNDER TRAINING CITED LACK OF RECENT FLIGHT EXPERIENCE AS PRIMARY CAUSE OF DEVIATION.

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INSTRUCTOR UNDER TRAINING FORMATION FLT. FIRST NIGHT LEAD FOR INSTRUCTOR AT CTLS. FLT FLEW A SECTION ILS APCH. CLBOUT INSTRUCTIONS WERE TO CLB TO 3000 FT RWY HDG. FLT SEPARATED ON SHORT CLB TO 3000 FT. INSTRUCTOR UNDER TRAINING AT THE CTLS HAD DIFFICULTY MAINTAINING THE LEAD ACFT IN A PREDICTABLE FLT REGIME TO EXPEDITE THE RENDEZVOUS AND THEN EXECUTED A NONSTANDARD RE-CONFIGN OF THE FLT; FURTHER COMPOUNDING THE CONFUSION. AS THE REAR SEAT OCCUPANT; I SAID ALT APCHING 3000 FT; REPEATED IT TO HIM; HE WAS DISTR BY THE COMS WITH HIS WINGMAN REGARDING THE CONFIGN AND LIGHT INTENSITY. AT THIS POINT I DEEMED IT UNSAFE TO TAKE THE CTLS AND ABRUPTLY LEVEL OFF; AT NIGHT WITH THE WINGMAN IN CLOSE PROX. I DID INFORM APCH WE NEEDED 4000 FT AS WE WERE LEAVING 3400 FT. FLT WAS DEBRIEFED AND TRAINING WILL BE CONDUCTED FOR ALL INSTRUCTORS UNDER TRAINING. SUPPLEMENTAL INFO FROM ACN 813043: MIL NIGHT FORMATION TRAINING FLT (2 ACFT) FOR LEAD INSTRUCTOR PLT UNDER TRAINING AND WINGMAN INSTRUCTOR UNDER TRAINING. SECTION LEAD EXECUTED AN ILS TO FINAL AND DETACHED THE WINGMAN FOR A TOUCH-AND-GO REJOIN. LEAD PLT STARTED A SLOW CLBOUT WHILE THE WINGMAN JOINED. WHILE FIXATING ON AIRSPD AND A JOINING WINGMAN; LEAD PLT EXECUTED AN INADVERTENT SLOW CLB THROUGH ASSIGNED ALT OF 3000 FT. LEAD ACFT PLT LEVELED AT 4000 FT. LEAD PLT EXPERIENCED MILD DISORIENTATION/VERTIGO FROM CULTURAL LIGHTING AND HAZY CONDITIONS DURING CLBOUT DUE TO FOCUSING ON WINGMAN JOINING (LOOKING BACK AND DOWN WHILE CLBING). LEAD PLT HAD 3 NIGHT FLTS IN LAST 4 YRS DUE TO AN EXTENDED GND TOUR (OUT OF COCKPIT ASSIGNMENT). LEAD PLT COMPLIED WITH ALL OTHER ATC QUESTIONS/INSTRUCTIONS DURING THE FLT AND CONTACTED ATC AS INSTRUCTED AFTER LNDG.