When were the warrior ethos created?

The Warrior Ethos, as a formalized concept, has roots in ancient military traditions, but it was most notably articulated in the modern context by the U.S. Army in the early 2000s. The Army's "Warrior Ethos" was officially adopted in the Army's 2001 edition of the "Soldier's Creed," emphasizing values like loyalty, duty, respect, selfless service, honor, integrity, and personal courage. Its creation aimed to instill a mindset among soldiers that underscores commitment and resilience in the face of adversity.