Could the U.S. Implement Mandatory Military Service?

In April of 2018, President Trump signed a defense bill which called for a significant expansion of the military. The goal was to recruit 80,000 new soldiers for the Army by the end of the year. As 2019 started, it became clear that this goal was not even close to being reached. In fact, Myers of ArmyTimes notes that the Army, Army Reserve, and the Army National Guard all did not meet their 2018 recruiting goals.