POTENTIAL CONFLICT OCCURS BTWN ACR LGT AND 2 MIL FGTS WHEN WINGMAN PIC OF FGT FORMATION HAS ALTDEV ALT EXCURSION AND ACR TCASII RA INDUCES ACR PF TO ALSO GO THROUGH AN ALTDEV IN AN EVASIVE ACTION CLB. POSSIBLE NMAC.

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AT 27000 ON AR-11; TCASII GAVE A TA; 12 O'CLOCK AT 900 FT ABOVE OUR ALT AND DSNDING. TCASII THEN ISSUED AN RA 'CLB; XING CLB'. TCASII SHOWED TFC AT 600 FT ABOVE OUR ALT AND DSNDING. I IMMEDIATELY DISCONNECTED THE AUTOPLT AND FLEW THE TCASII ADVISORY INFO ON THE VERT SPD INDICATOR (INDICATING +2300 FPM OR BETTER TO CLR CONFLICT). CENTER THEN PICKED UP OUR ALTDEV AND ASKED WHAT THE PROBLEM WAS. I BELIEVE THAT THE 2 FGTS FLYING IN FORMATION DIPPED BELOW 28000 FT AS ASSIGNED. TCASII THEN PICKED UP DSCNT RATE AND THE REST IS AS EXPLAINED. IN THIS SITUATION; TCASII WAS; IN MY OPINION; SETTING US UP FOR A POTENTIAL MIDAIR. IT WOULD'VE BEEN SAFER TO STAY AT 27000 FT; BUT AS COMPANY PROCS DICTATE; ONE MUST FLY ACCORDING TO THE ADVISORY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ON CALLBACK RPTR STATED THAT HAD THE CTLR GIVEN A TA; HE WOULD NOT HAVE FOLLOWED THE COMMANDS OF HIS TCASII RA. RPTR IS OR WAS A MIL PLT ALSO AND HAD FLOWN THESE FGT MISSIONS IN FORMATION. HE STATED THAT THE WINGMAN USUALLY 'HORSES AROUND' IN ALT; VARYING ABOUT 200 FT UP AND DOWN; JUST TO RELAX AND BREAK THE LEVEL OF CONCENTRATION OR MUSCLE TENSION. THE CTLR WAS HEARD TO TELL THE FLT LEADER TO HAVE HIS WINGMAN SQUAWK 'STANDBY.' THIS INFERRED THAT; BECAUSE THE WINGMAN FORGOT TO SQUAWK STANDBY; THE USUAL WINGMAN MODE; THAT IT APPEARED TO THE ACR TCASII THAT THE FLT OF 2 HAD LEFT FL280; INSTEAD OF 1 HAVING AN EXCURSION. THIS PLACED THE ACR IN JEOPARDY NOW BECAUSE THE FLT WAS ACTUALLY AT FL280; NOT DSNDING TO ACR'S ALT. THE TCASII DID NOT KNOW THAT; BASING INFO ON A TRANSPONDER MODE THAT WASN'T ON STANDBY. WHEN ASKED WHY A TA WASN'T GIVEN; CTLR DID NOT ANSWER. RPTR ASSUMED THAT A SUPVR WAS NOW ON THE SCENE AND CTLR HESITATED TO MAKE ANY STATEMENTS REF EVENT. RPTR WANTS THIS INFO DISSEMINATED SO THAT MIL FGTS MAY BE REMINDED OF THE IMPORTANCE OF 'STANDBY' ON TRANSPONDER OR NOT 'HORSING' AROUND IN ALTDEVS.