Lessons Learned

Lessons Learned is one of several short stories in Halo: Fractures - Extraordinary Tales from the Halo Canon.

Official summary
"This story begins on March 29, 2554, more than a year after the end of the Covenant War (Halo 3) - a thirty-year struggle for humanity's survival waged across its embattled colonies - and the subsequent activation of the SPARTAN-IV Program, which would eventually undergird the United Nations Space Command's fledgling Spartan branch (Halo: Initiation)."