Lisa Jaster is an American soldier and an engineer. She is one of only three women to graduate the United States Army Ranger program. —one of the most difficult combat training courses in the world—Lisa was the first female Army Reserve officer to become a Ranger. She completed the training, which 36 percent of male and female students fail within the first four days, after refusing to succumb to exhaustion and repeatedly "recycling" through, or retrying, several phases of the multi-locational course. Lisa endured the training, which takes a minimum of 61 day and includes up to 20 hours of training per day alongside a strict diet, for a grueling six months. She graduated at age 37, while the average trainee age is 23.