Project ORCHID

"We're not exactly like those artificial gods from the earlier generations. More like demigods. And I'll be damned if that usually isn't good enough."

- Edward Buck

The SPARTAN-IV Augmentation Program is the formal name for the biochemical and surgical augmentation procedures performed on the SPARTAN-IV supersoldiers. As with the recruitment methodology of the SPARTAN-IV program, the scope of their augmentations hearkens back to the ORION Project's less extensive physical enhancement more so than the decidedly more superhuman SPARTAN-IIs and SPARTAN-IIIs, although several all-new procedures are also introduced.

Background
Based off of the previous augmentations performed for the SPARTAN-Is, SPARTAN-IIs, and SPARTAN-IIIs, the SPARTAN-IV augmentations continued to improve the process of enhancing a candidates' physical and mental capabilities as well as to make it a lot more safe. The SPARTAN-III augmentations represented a "quantum leap" over the previous SPARTAN-II program due to the fatality rate dropping to near 0% while producing similar super-solider results. The SPARTAN-III augmentations were mostly chemically induced versus requiring the many highly invasive surgical implants that the SPARTAN-II program required; yet, the SPARTAN-IIIs were considered to be on par with the SPARTAN-IIs when wearing MJOLNIR armor which speaks to how good the enhancements were. The technology used in these two preceding SPARTAN programs necessitated that the candidates meet exceedingly strict genetic qualifications as well as the application of the enhancements on preteens in order to avoid the catastrophic failure rates produced by the augmentation of adult subjects in the ORION Project. By the time of the initiation of the SPARTAN-IV program, the technology had advanced to the point that some of the previously dangerous procedures (both chemically and surgically) could be performed fairly safely on adults and without stringent genetic requirements, but there were still some risks because the subjects were often not genetically speaking ideal and they're bodies were no longer in the developing stages of their life; therefore, the process often focused on modifying the individual through carefully custom-tailored enhancements in order to bring them to the closest margin possible of the two previous Spartan programs.

Augmentations
While the enhancements have not been described in detail, they incorporate technologies originating from the prior SPARTAN programs as well as completely new additions; however, because the SPARTAN-IV program was designed to allow a large variety of military volunteers to become Spartans including less than ideal (genetically speaking) individuals/adults many of those candidates will be heavily reliant on their GEN2 MJOLNIR armor to preform up to the same levels of the Spartans from the previous programs.

Experimental phase
A series of additional augmentations were included in the earliest, prototypical phase of the program. These enhancements would have made the Spartans significantly stronger and more resistant to injury, the goal being that they could operate without MJOLNIR armor. However, these procedures proved to have an unacceptable casualty rate, killing or crippling nine of the ten initial candidates; the sole survivor, Ilsa Zane, was rendered mentally unstable. Demonstrating the effectiveness of these experimental enhancements, Zane was able to engage a MJOLNIR-armored Sarah Palmer in hand-to-hand combat without the use of any protective equipment, and survived Palmer violently driving her head into a metal bulkhead face-first, as well as her subsequent prolonged exposure to the vacuum of space.

Procedure
The SPARTAN-IV augmentation procedures take three weeks to perform, with recovery and subsequent training usually lasting several months. It took about two days for the Spartans to relearn how to walk again following their augmentations; additionally, significant disorientation was in evidence during their initial training exercises.

The augmentation procedures were conducted in a dedicated SPARTAN-IV facility on Mars and were noted to be considerably painful. There were approximately two dozen candidates being augmented and conditioned at any given time during the second SPARTAN-IV class, which Edward Buck was part of.

Effects
The synthetic cardiac weave allegedly allows a SPARTAN-IV to "outrun a horse"; this would imply speeds of up to, or over, 50 km/h. The enhancements performed on the lungs potentially allow a SPARTAN-IV to breathe methane for around an hour. Nutrition-wise, it is also said that a Spartan could eat a raw tree and retain the equivalent of six meals' worth of calories in terms of energy. According to Edward Buck, the ocular implants enabled him to see in the dark and read the fine print on release forms "from across the room". The subject's hearing is also greatly improved.

However, the decision to augment adults as opposed to preteens may come at the cost of some physical performance; especially, given that younger Spartans have more time in their peak years to further acclimate themselves to their augmented bodies. To compensate for any potential physical shortcomings the GEN2 MJOLNIR armor is designed to increase the wearer's strength and reaction speed significantly to the point that all Spartans are on a near level playing field. In theory this would make a lesser Spartan clad in GEN2 armor fairly equal in terms of strength and speed to a more capable Spartan also clad in GEN2 armor, but leaves the lesser Spartan at a considerable disadvantage to the superior Spartan when out of MJOLNIR armor.

SPARTAN-IVs must follow a rigid set of guidelines to maintain their physical fitness and health. These include undergoing regular medical examinations, including physiological scans, reviews and treatment before and after each mission. A SPARTAN-IV is expected to perform at optimum capacity with a minimum of two-and-one-half hours of sleep per a 48-hour cycle; for cryosleep, standard UNSC practices apply. They are also instructed to follow standard UNSC physical training practices. Due to their augmented physiques, however, they are provided their own, custom-built gym equipment. Official meals are specifically prepared to meet the caloric, nutritional and medicinal needs of each individual Spartan. These personal needs are measured based on activity data recorded by the Spartan's individual physiometer. Ancillary medications may be provided to ensure the Spartan's well-being and to reduce risk of potential implant rejections.

Performance
Training performance of the initial SPARTAN-IV batch in 2553 was decidedly underwhelming, something that was acknowledged by their recruiter, SPARTAN-III supersoldier Jun-A266. Part of this may be attributed to their still-ongoing acclimatization to their enhancements, as well as the group not having worked together before, although all of them did possess a military background. The majority of the first batch of SPARTAN-IVs were incapacitated by their baseline human Marine training opponents, who outnumbered them ten to one, and their lack of coordination resulted in SPARTAN-IV program head, Commander Musa-096, personally chastising them about the importance of teamwork (a lesson the SPARTAN-IIs learned in their first days of training at the age of six). However, several SPARTAN-IVs of this group later distinguished themselves in live combat during the New Colonial Alliance's attempted takeover of.

Later combat performance also shows marked improvement to the training sessions of the initial group. During the 2555 mission to Talitsa, Spartan Edward Buck fought Michael Crespo in hand-to-hand combat and shattered the visor of the latter's MJOLNIR GEN2 armor by pummeling it repeatedly. Spartan Kojo Agu killed multiple Insurrectionists by throwing rocks at them before procuring a weapon from the fallen rebels. Agu subsequently assaulted a rebel stronghold singlehandedly, eliminating numerous Insurrectionist combatants.

During the Requiem Campaign, Spartan Gabriel Thorne was able to fight five Sangheili in close-quarters combat and successfully kill them before being subdued by two other Sangheili. Thorne also took on a battle-seasoned Sangheili, Gek 'Lhar, in hand-to-hand combat and had the upper hand for a majority of the brawl, before having a boulder smashed on his chest and unprotected head, dazing him. Later on during the Requiem Campaign, Spartan Paul DeMarco was able to defeat multiple Sangheili and a Promethean Knight in close-quarters combat. During the Battle of Ealen IV, Spartan Naiya Ray took on and defeated a Sangheili Warrior in close-quarters combat. While on a War Games simulation marathon, Sarah Palmer fought and killed a Hunter with her bare hands.

List of appearances

 * Halo 4
 * Infinity Briefing Packet
 * Halo: Initiation
 * Halo: New Blood