i unlocked the marathon shoulders in halo 3 when i unlocked the marathon man achievement. i wore them for about 2 weeks, untill one day i cheked my servise record and my shoulders were reseted to mark 5. i looked 4 security shoulders but it said they were locked. y did it relock itself? and i already have the achievement now, so how can i get it back? also sumtimes i go on and it sais i have the security shoulders but as soon as i put them on my guy they reset to mark 5 and it shows up as locked. i have marathon man achievement over 750 gamerpoints and 36 out of 49 achievements if any of that matters.