In this episode Klinger is promoted to Sergeant( E-5) he'll stay Sergeant for the remainder of the series.
Igor and Rizzo's applications to Winchester's promotion board are even more hopeless aside from their wrong answers. Namely, applicants for promotion are supposed by regulations to appear in their dress uniforms: Klinger is the only one who does while Igor and Rizzo appear in their regular duty fatigues.
When Danielson visits Colonel Potter in his tent, Potter is reading a fully intact copy of "The Rooster Crowed at Midnight" by Abigail Porterfield, the novel with the missing last page that the entire camp read in The Light That Failed (1977).
Klinger becomes the 4th (and final) regular (main cast) member of the 4077th to obtain a promotion during the course of the show. Major Frank Burns was promoted to Lt. Colonel after leaving the 4077th and being reassigned. Father Lt. Frances Mulcahy was promoted to Captain midway through the series. Corporal Radar O'Reilly was briefly and fraudulently promoted to Lieutenant in a prank initiated by Captain Honeycutt.
I-Corps is a corps of the United States Army headquartered in Joint Base Lewis-McChord, Washington. It is a major formation of United States Army Pacific (USARPAC) and its current mission involves administrative oversight of Army units in the Asia-Pacific region, including the Pacific Pathways program.