Military personnel in uniform are required to salute when they meet and recognize persons entitled (by grade) to a salute except when it is inappropriate or impractical (in public conveyances such as planes and buses, in public places such as inside theaters, or when driving a vehicle).
One notable player, Shawn Kemp, enrolled in college but never played any games due to personal problems. In 1989, a year after his high school graduation, he was drafted by the Seattle SuperSonics. He played 14 seasons in the NBA and was selected to 6 All-Star Games and 3 All-NBA Teams.
It is highly unlikely that Purdue will have a player drafted tonight in the NBA Draft. Point guard Jon Octeus has a small chance at being a second rounder and has worked out for several teams, but he is no mock drafts that I can find. The only other player eligible is senior walk-on Neal Beashears.