In assessing comparators for a claim of workplace discrimination, the plaintiff's demonstrated ability in performing the present job should be taken into account.
Transfer to the Commissary, even absent diminution in rank or pay, was a sufficiently adverse employment action.
http://media.ca1.uscourts.gov/pdf.opinions/16-1597P-01A.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.