Rob's rank in these flashback keeps changing. In season one (Oh, how we met on the night that we danced) and season 2 when they are engaged (Will You Two Be My Wife) and season 4, married (Pink Pills and Purple Parents) Rob is an E-6/Staff Sergeant. When he proposed to her in Season 2 (The Attempted Marriage) he is an E-7/SFC/Plt Sgt {Extremely fast promotion for a peace time Army}. When they are dating, season 5, (Body and Sol) (No Rice at My Wedding) and When they are on their Honeymoon in season3 & on a trip to Mexico in season 5 (Honeymoons Are for the Lucky & Remember the Alimony) he is a E-5/Sergeant. This would have been an EXTREMELY checkered career.