The "total reported personnel strength of the Ready Reserve" as of July 31, 2021, according to a recently updated report from the Congressional Research Service -- Reserve Component Personnel Issues: Questions and Answers.
The number of "beneficiaries" served by Military Health System (MHS) in the U.S. and abroad, according to a recently updated Congressional Research Service report -- Military Medical Care: Frequently Asked Questions.
The percentage of Army recruits between 2001 and 2012 who "needed some kind of waiver to get in, most often for health reasons," according to an article in the Rand Review -- Army Enlistment Waivers in the Age of Legal Marijuana
The percentage of veterans believed by the American public to be suffering from PTSD, according to a recent survey by the Cohen Veterans Network, "a not-for-profit philanthropic organization that serves post-9/11 veterans, military families and active duty service members through a nationwide system of mental health clinics". In reality, according to the survey, "PTSD impacts 11-20% of Iraq and Afghanistan War veterans, approximately 12% of Gulf War veterans, and 15% of Vietnam veterans."
The percentage of Service members hospitalized with a traumatic brain injury in a recent study who "will develop long-term disability", according to an article published earlier this year in the Journal of Head Trauma Rehabilitation -- Estimates of Long-Term Disability Among US Service Members With Traumatic Brain Injuries.