You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did the marine corps start the crucible?" whose answer is 1996.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the marine corps start the crucible
Useful Output:

Doc 1: First implemented in 1996 by the 31st Commandant of the Marine Corps, General Charles C. Krulak, The Crucible was meant to be “a culminating
Doc 2: The Marine Corps crucible is a 54-hour event that tests physical stamina, mental toughness, and the ability to think critically while under
Doc 3: The crucible has been part of Marine Corps training since the 1990s. Although the Marine Corps has different physical fitness standards for
Doc 4: In 1996, General Krulak implemented the Crucible. A lot of current Marines did not approve or understand why he made the change.
Doc 5: I went through boot camp November of 1990-February(?) 1991. The Crucible didn't start until 1996, if I read the website correctly.