From Halopedia, the Halo wiki
Denning entered the SPARTAN-IV program as a recruit, where they were put through training at the Avery J. Johnson Academy of Military Science. Denning was later seen socializing at the academy with Spartans Ionescu and Page before a live-fire exercise. During the exercise Denning competed alongside Spartans Leung, Eusebio, and O'Brien. They faced off against Spartan Commander Laurette Agryna, Spartans Ionescu and Page, and one other spartan recruit.
Spartan Denning is named after Troy Denning, the author of a number of Halo novels and a short story.
List of appearances