The year I PVR'd was the year the airman assessments changed from being rated in a scale of 1 to 9 to being rated on a score of 1 to 6. Th official reason was that anyone getting a score of 1 to 3 really had no point still being in uniform, but as I quipped to my Chief during the interview "This new system means you just have a role a dice to see what you're giving us..."
His wry smile indicated either this was a bad attempt at humour or too close to the truth...