Since the U.S. Army’s inception in 1775, it has reorganized or transformed its force structure on several occasions.
These changes have occurred for a variety of reasons, such as shifting security requirements; to fight the nation’s wars and conflicts; the introduction of new weapons, such as tanks and nuclear weapons; and budgetary considerations.

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| Website: | Visit Publisher Website |
| Publisher: | Congressional Research Service |
| Published: | March 28, 2024 |
| License: | Public Domain |