From Halopedia, the Halo wiki
2517 was a year in the 2510s in the 26th century. It was a very important year for the United Nations Space Command, as this marked the initiation of the candidate procurement and training of the SPARTAN-II program, which would eventually give birth to some of humanity's greatest heroes.
- Dr. Catherine Halsey initiates the screening process for SPARTAN-II candidates. Vice Admiral Michael Stanforth provides her with the Vancouver-class courier Han and Lieutenant Junior Grade Jacob Keyes as a requisite pilot and attaché. Halsey goes on to survey candidates in Sector 4 while her team does the same elsewhere in the colonies.
- At 0430 hours; Dr. Catherine Halsey and Lieutenant Junior Grade Jacob Keyes wake from cryo chambers on the Han as it arrives near Eridanus II, and discuss the plan to meet a child on the planet.
- At 1130 hours; Dr. Halsey and Lieutenant Keyes meet 6-year-old John, candidate #117, on Eridanus II. John passes a test conducted by Halsey and is unknowingly accepted into the SPARTAN-II program.
- On Sansar, Staffan Sentzke sneaks into his house red-and-white wrapping paper for his daughter Naomi Sentzke's birthday.
- Dr. Catherine Halsey selects the final seventy-five candidates for the Spartan-II tells the "Dumb" Artificial intelligence Déjà to give the order to kidnap them for Spartan-II program.
- At around 1700 hours, on Sansar; Staffan Sentzke and Lena Sentzke prep for their daughter Naomi's birthday, while she is heading home from music practice. During the ride home, Naomi heads off the bus early and is conscripted for the SPARTAN-II program, and Staffan and Lena worry about where she went.
- At 2005 hours, the local police on Sansar are hunting for Naomi using canine unit and the Pelican unit.
- At around 0600 hours on Sansar; the flash clone of Naomi is found at a bus stop southwest of New Stockholm.
- Dr. Catherine Halsey records in her journal that every Spartan-II candidate exceeded the selection criteria.
- Dr. Catherine Halsey records in her journal that on Imber, Kelly Shaddock eluded Retrieval team Gamma for six hours but eventually comes forward, thinking abduction is a game for her birthday. Her near-escape results in the implementation of new retrieval protocols to avoid further mistakes.
- Dr. Halsey and Jacob Keyes part ways after screening candidates for the SPARTAN-II program. Afterwards, Dr. Halsey has Jacob Keyes promoted to full Lieutenant and reassigned to the UNSC Magellan.
- The 75 children kidnapped for the SPARTAN-II project are brought on Reach and conscripted into the SPARTAN-II program per Naval Code 45812.
- The 6-year-old SPARTAN-II trainees awaken for their first day of training. They are led by Chief Petty Officer Franklin Mendez and are introduced to the AI Déjà.
- The cargo vessel UNSC Dartmouth is boarded and seized by the Eridanus rebels.
- The SPARTAN-II candidates receive haircuts. Kelly-087 disarms the master sergeant barber of his clippers; three attendants are required to pin her down and shave her head.
- At 0901 hours; John-117's flash clone dies.
- Dr. Halsey receives a report on the unexpected longevity of the SPARTAN-II flash clone replacements and assigns Codename: JACKBOOT to track their further progress.
Around seven weeks prior to August 17, 2552
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: July 21, 2517
- Halo: The Fall of Reach, chapter 1
- Halo: The Fall of Reach, chapter 2
- Halo: Mortal Dictata, chapter 1
- Halo: Fall of Reach - Boot Camp, issue 1
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: Candidate Record "Carris R Pernault"
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: September 15, 2517
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: September 15, 2517 "Addendum"
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: September 16, 2517
- Halo: The Fall of Reach, chapter 3
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: Candidate Record "Kurt M Trevelyan"
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: Candidate Record "Caleb F Aagard"
- Halo: The Fall of Reach, chapter 4
- Halo: Fall of Reach - Boot Camp, issue 2
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: September 28, 2517
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: Picoliter "Date: 11/04/2517"
- Hunt the Truth - Season 1, Twitter: UEG public record
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: December 24, 2517