It’s a fairly recent development. It was created as the department of war by Washington and remained that until 1947 where it split into the departments of the air force and army, joining the already existing department of the navy, which together made up the national military establishment (NME), which was renamed 2 years later to the DOD.
Oddly enough, this also coincides with the time when the US military was more explicitly about offence rather than defense. After the Revolution, people mistrusted the federal government having a large standing army. The army was raised up in time of war, and everyone went home when it was over.
Post-WW2 was the first time the US kept a large army in “peace”. Been that way ever since.
It’s a fairly recent development. It was created as the department of war by Washington and remained that until 1947 where it split into the departments of the air force and army, joining the already existing department of the navy, which together made up the national military establishment (NME), which was renamed 2 years later to the DOD.
Oddly enough, this also coincides with the time when the US military was more explicitly about offence rather than defense. After the Revolution, people mistrusted the federal government having a large standing army. The army was raised up in time of war, and everyone went home when it was over.
Post-WW2 was the first time the US kept a large army in “peace”. Been that way ever since.