Intermediate picks up where Primary ends for USAF SWSOs. After the instrument phase of training, students move to visual navigation (VNAV) "low levels" at 2000'AGL, and finish in the T-6 with a final training block called "forms" (formation flying). Forms consist of four flights of learning the basics of close in formation flying. After forms, SWSOs head back to ground school to learn an entirely new aircraft, the USN T-39 Sabreliner. The T-39 is used as an intermediate instrument and low-level trainer for SWSOs, where they receive a total of eight flights. Students are required to learn the aircraft in a two-week ground school period before they go flight side. In contrast, T-6 ground school is four weeks. Training ends at either VT-10 or VT-4 with the "i-grad" ceremony and top graduate award.