21st Infantry Regiment Battalions
Modern Era, United States, Infantry
This second-pass battalion page ties each battalion icon more directly to the parent regiment's established story. Until a battalion-by-battalion lineage research pass is completed, the copy below should be read as regiment-specific context rather than as a final battalion lineage sheet.
1st Battalion, 21st Infantry Regiment
This entry now anchors the battalion page in the regiment's origin or defining early identity, giving the 1st Battalion slot a more specific historical frame than the first scaffold pass.
The 21st Infantry Regiment traces its lineage to the post-Civil War Regular Army and built its reputation through frontier duty, the Indian Wars, and later overseas service in the Spanish-American and Philippine-American wars. Over time it became one of the long-serving line regiments of the Regular Army.
2d Battalion, 21st Infantry Regiment
The 2d Battalion entry uses the regiment's middle or operational arc to give the page a clearer sense of how the parent unit developed over time.
In the twentieth century the regiment served in major Pacific and Asian campaigns and became especially associated with the Army's fighting in World War II and Korea. Its battalions later carried the lineage into the Vietnam-era Army and then into the Pacific-centered force structure of the late Cold War and after.
3d Battalion, 21st Infantry Regiment
The 3d Battalion entry now carries the regiment into its later or enduring modern identity, tightening the page around the way the lineage is remembered in the modern Army.
Today the regiment survives through battalion lineage rather than a full regimental headquarters, but the 21st Infantry remains identified with the hard-service tradition of the old Regular Army and with modern combat service in the Pacific theater.
Research note: This second pass replaces the generic scaffold text with regiment-specific context drawn from the parent regiment page. Dedicated battalion-level lineage research is still deferred to a later pass.