Who designed the Marine Corps seal and when was it adopted?

The Marine Corps seal was designed by General John A. Lejeune in 1920 and was officially adopted during that time. General Lejeune played a pivotal role in standardizing the emblem and ensuring that it represented the values and history of the Marine Corps effectively. The seal features elements such as the eagle, globe, and anchor, which symbolize the Marine Corps' commitment to serving the nation on land and sea.

The context surrounding the adoption of the seal by General Lejeune and its design reflects the need for a unified symbol that could encapsulate the identity and mission of the Corps, which had evolved significantly by the early 20th century. The other options provided do not accurately reflect this historical milestone. General Shepherd, General Amos, and General Puller each contributed to the Marine Corps in various ways but were not involved in the creation and adoption of the seal itself.