The 41st was first activated for U.S. Army service on 1 April 1917 , just five days before the American entry into World War I , primarily from Guard units of the northwestern United States .
The 41st was first trained at Camp Green , North Carolina .
The 41st was first activated for U.S. Army service on 1 April 1917 , just five days before the American entry into World War I , primarily from Guard units of the northwestern United States and trained at Camp Green , North Carolina .