26 July 1947
A department is written into law.
Darker cells mean a higher score for this topic on that metric.
Scale80
Intensity55
Duration74
Tech shift86
Political impact88
Cultural memory78
LessMore
Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
Are the scores a ranking of nations or armies?
No. Scores are browsing aids inside an era-bounded atlas — not live league tables of countries.
Why is the Civil War notable here?
It was the first US mass industrial army and a cost on the American Civil War page. It is not the origin of the 1947 department.
How does Korea fit?
1950-53 was the first large hot war of that department and produced the 1953 US-ROK treaty. Inchon, Ridgway, and the armistice are dated hinges. See the Korean War and Inchon pages.
What was MacArthur's relief?
President Truman relieved General MacArthur on 11 April 1951 -- a civil-military crisis in a shooting war. A political history, not a staff-college stunt to copy.
Is this a current force list?
No. No live ORBAT, no basing directory, no nuclear employment, no special-operations method.
What was Goldwater-Nichols?
A 1986 law pushing joint service operations -- an institutional reform date in the public file.
Yorktown as origin myth, 1864-65 as mass, 1944-45 as peak, Inchon-to-armistice as the department's first hot campaign set -- dated.
Details of battles live on their pages.
Principles
1950-53
The first hot war of that department.
1 October 1953
A treaty that still structures a peninsula -- as history.
Goldwater-Nichols
1986 jointness law -- an institutional reform date. Read as a 1775 origins; 1861-65 mass army; 1941-45 global peak; 1947 National Security Act as the modern department hinge concept in A continental republic that became a global basing and alliance system after 1941.
Mutual Defense Treaty (1953)
US-ROK alliance text -- a political object. Not a present instruction.
Steps
- Continental forces
1775: A revolutionary origin, not yet a Pentagon.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
- Civil War mass army
1861-65: The first industrial-scale US force.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
- AEF in France
1917-18: A late mass expedition.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
- Global mobilisation
1941-45: The industrial peak.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
- National Security Act
1947-07-26: Department, CIA, USAF as a legal shape.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
- NATO
1949: A European alliance structure.
A dated beat of United States military in A continental republic that became a global basing and alliance system after 1941. Sequence as history, not as a campaign to copy.
Diagrams
From Continental forces (1775) through NATO (1949) to AVF and Goldwater-Nichols (1973 / 1986) in A continental republic that became a global basing and alliance system after 1941. One sequence, not a staff overlay.
George Washington (Commander / president) and Ulysses S. Grant (General / president) sit at the centre of most English accounts; Matthew Ridgway and Colin Powell correct the usual photograph.
Limits
Source limits
Figures such as "not one war -- an institution; human cost sits in the wars this atlas already files" stay in ranges because records are incomplete, political, or still closed. Why is the Civil War notable here? is answered as a band.
No how-to
United States military is era-bounded force-structure history, not a live order of battle or mobilisation how-to.
Memory bias
English-language fame of United States military and local memory in A continental republic that became a global basing and alliance system after 1941 are not the same map. Colin Powell is often the correction the first photograph drops.
MacArthur's relief is a campaign-politics event.
Do not draw a present war plan from a 1950 map.