Marine sergeants trying to get another look at staff sergeant can now apply for a waiver to remain in uniform before hitting their 12-year limit. The Marine Corps updated its rules for sergeants who've been passed over for promotion twice or are approaching the end of their 12-year window to make staff sergeant. Instead of limiting waiver applications to just those who've served a dozen years and have already been considered for promotion two times, sergeants can now apply for the waivers earlier in their careers. That could allow them to extend their service contracts to 14 years earlier on. The change was announced in Marine administrative message 408/19. Read more on Military.com.