We (USAF) have become more conservative in the way we calculate our bingo's in training over the years. When I was a young guy and flew on clear VFR days, we would routinely get the "mission complete light" while in the pattern. That light is FUEL LOW which comes on at 1600+/- 200. The rule is still 2000# on initial or at the FAF for VFR days but I routinely see guys landing with 4-5k# these days. And they wonder why they get less flying time than we used to? Bah humbug, I'm just old now. haha!