Final answer:
Reservists must complete their Periodic Health Assessment (PHA) as per their branch's requirements, which ensures readiness. Since the Iraq War, there has been an increase in reservists' active duty, potentially affecting the frequency of PHAs in line with increased annual drill requirements.
Step-by-step explanation:
The requirement for reservists to complete their Periodic Health Assessment (PHA) is contingent upon the regulations set forth by their respective military branch. Although the information provided does not directly state the frequency of the PHA, it does highlight changes in the operational tempo of reservists. Since the Iraq War, there has been a significant increase in the mobilization and active duty use of National Guard and Reserve personnel. As of July 2012, the Army's top general expressed intentions to increase the annual drill requirement from the traditional "One weekend a month, two weeks a year" to potentially up to seven weeks per year.
Reservists are generally required to maintain a certain level of readiness, which includes completing their PHA. However, specific timelines and requirements may vary depending on a member's duty status, deployment cycles, and service-specific regulations. It is recommended that reservists stay informed of the latest directives from their commanding officers and official military healthcare providers.