The U.S. active-duty military size is about 1.3 million personnel as of 2025, with total active-duty forces across all branches ranging roughly from 1.28 to 1.33 million depending on the exact month and data source. Around 1.3 million active-duty members are complemented by roughly 700,000–770,000 reservists/National Guard members, plus civilian staff in the broader military ecosystem. Specific branch counts typically cite Army largest (roughly mid-400 thousands), followed by Navy (about 330k), Air Force (around 310k), Marine Corps (about 160–170k), Space Force (tens of thousands, around 9–10k), and Coast Guard (roughly 40k). For the most current figure by month, consult the latest official Defense Department or government demographic releases, as these numbers are updated periodically.
