|Jack Personal Armor
Jack Personal Armor is a natural or synthetic leather jacket or body suit covering the torso and upper arms and legs.  Jack is a leather covering worn over the torso, arms, and legs. Although jack is ineffective against firearms and energy weapons, it is useful on high law level worlds which permit only blade weapons. It is light, inexpensive, and easy to purchase on nearly any world. 
Jack is somewhat better than ordinary clothing or bare skin when defending against blades; it is worthless against guns. 
- Marc Miller. Characters and Combat (Game Designers Workshop, 1977), 41-43.
- Marc Miller. Imperial Encyclopedia (Game Designers Workshop, 1987), 74,75.
- Marc Miller. "Imperial Soldier’s Weapons & Armor Guide." MegaTraveller 1: The Zhodani Conspiracy (1990): 131.
- Martin Dougherty. Guns, Gadgets and Gear (Avenger Enterprises, 2007), 44.
- Marc Miller. T5 Core Rules (Far Future Enterprises, 2013), 629.
- Matthew Sprange. Core Rule Book (Mongoose Publishing, 2016), 95.
- Matthew Sprange. Central Supply Catalogue (Mongoose Publishing, 2016), 12.