138th Infantry Regiment (United States)

138th Infantry Regiment
Coat of arms
Active1832 to 1974 -- 2010 to Present
CountryUnited States
BranchMissouri Army National Guard
TypeLight Infantry
SizeRegiment
Nickname(s)First Missouri
Motto(s)St. Louis' Own
EngagementsMexican War
American Civil War
World War I
World War II
Operation Enduring Freedom
Operation Spartan Shield
Operation Inherent Resolve
DecorationsMeritorious Unit Commendation Governor's Unit Citation
Commanders
1st BN-138th IN REGTLTC Timothy (TJ) Halls
3rd BN-138th IN REGTLTC Tyson K Erdman
Insignia
Distinctive unit insignia

The 138th Infantry Regiment is a light infantry regiment of the United States Army and the Missouri National Guard.

There are currently two Battalions within the 138th Infantry Regiment:

The 1st Battalion, 138th Infantry Regiment is a light infantry battalion assigned to the 39th Infantry Brigade Combat Team, subordinate to the 35th Infantry Division. Headquartered at Jefferson Barracks.

The 3rd Battalion, 138th Infantry Regiment is a light infantry battalion assigned to the 72nd Infantry Brigade Combat Team (United States), subordinate to the 36th Infantry Division. As of 2024, the unit wears the 110th Maneuver Enhancement Brigade's patch until the official alignment is completed. Headquartered in Kansas City, Missouri.