Conversation so far:
When did John J. Pershing report for active duty?
John J. Pershing reported for active duty on September 30, 1886.
When did John J. Pershing participate in Indian campaigns?
While serving in the 6th Cavalry, John J. Pershing participated in several Indian campaigns
Did John J. Pershing participate in the Wounded Knee massacre?
John J. Pershing and his unit did not participate in the Wounded Knee Massacre.

Question: When did Pershing receive his LL.B. degree?
Self-contained rewrite: When did John J. Pershing receive his LL.B. degree?