Which statement accurately describes a legislative change regarding military service in December 2011?

The correct response highlights that in December 2011, Congress formally repealed "Don't Ask, Don't Tell" (DADT), which had been the policy prohibiting openly gay individuals from serving in the U.S. military. This legislative change allowed both gay male and female personnel to serve openly without fear of discharge based on their sexual orientation.

This marked a significant shift in military policy, promoting inclusivity and recognition of the rights of LGBTQ+ service members. The repeal was a culmination of years of advocacy and represented a commitment to equal treatment within the armed services. Hence, the statement that accurately reflects this change is that Congress formally ended the prohibition of openly gay male or female personnel serving in the U.S. armed forces.

The other choices do not capture the full scope of the repeal or incorrectly specify limitations based on gender, which do not apply since the change affected all LGBTQ+ individuals.