Final answer:
The reference information does not specify the number of days leave for Reenlistment of a Soldier, as it focuses on reserves' annual drill requirements and presidential authority for troop deployment.
Step-by-step explanation:
The information provided does not directly answer the question regarding how many days leave a Soldier can be authorized for Reenlistment. The provided reference discusses changes to the reserves' duty commitments and the president's authority to deploy troops, but does not specify policies concerning reenlistment leave.