The patch on the back of Lambert's A-2 jacket is the Flying Tigers blood chit. These patches were issued to US pilots flying in China during WWII so they could be returned safely by Chinese people (most of whom didn't speak English) to US air bases in China, thus saving many lives. The flag on the chit is the Nationalist Chinese flag (now Taiwan). The chit reads, "This man is an American fighting for China. Please save and protect him as a fellow soldier." The Flying Tigers were a group of maverick pilots flying for Chiang-Kai-Shek. In a period of seven months, they shot down over 1000 Japanese planes in the air and on the ground while suffering only a few casualties. The jacket is government issue and doesn't include side-entry pockets.
In the opening credits of both seasons, Selma's voice over states, among other things, that Darien has only one weapon, during the scene of Darien in the future shooting a laser weapon in the future, but this is not the weapon he has.
Darien's PPT has three setting or colors. Blue pellets stun for five minutes, green pellets stun for up to three hours, and red pellets administer a dose of TXP which prepares the subject for teleportation to the future.