User blog comment:Marcymariehunter/ME2 and Kaidan/@comment-217683-20101120003615

Well... there is no "Commander" rank in the Alliance military. But yes, Alenko, as a Staff Commander, would outrank Shepard, a Lieutenant Commander, unless Shepard received some sort of posthumous promotion or something. But then again, Shepard in ME2 doesn't appear to still be in the Alliance military, so Alenko's rank really doesn't matter.