This article showed that the vast majority of court-martial sentences are affirmed by AFCCA. On the rare occasion when sentence relief was granted, it was usually not based on factual sufficiency or sentence appropriateness. While there has been some fluctuation in how often AFCCA grants sentence relief, it is minimal and to some extent explained by the influence CAAF has on it.
That’s the conclusion of Maj. Kevin Gotfredson and Capt. Micah Smith in their article, Sentence Relief: At the Air Force Court of Criminal Appeals During the Last 10 Years. 43(3) THE REPORTER 21 (2016). Their research was motivated by public discussion of an “epidemic” number of valid convictions being reversed because of “factual sufficiency.”
See more discussion at my website here.