Henry was born to Bert Hsieh and Wendy Lee on the colony of Miridem on May 2, 2537. During his civilian life, he grew up with his two younger brothers, Jim and Jack, in their home town. The three brothers were orphaned when the Covenant attacked Miridem and killed their parents in the year 2544. They were rescued in time by the Platinum Team, which escorted them to the nearest transport, successfully keeping the three children from enemy fire. The SPARTANs inspired the three brothers to become SPARTANs themselves in order to protect other civilians from the Covenant.
Team Dao was aboard Kano Station during the Battle of Earth. The Spartans defended the station from boarding Covenant infantry. While treating a wounded marine, Seung-ah was shot thrice in the right side of her back by a Covenant carbine. Although she did not flinch from her wounds due to the effects of the 009762-OO drug, Henry ordered Jim to escort her to the ship's cryo facilities, knowing that she had little time. When it was clear that Kano Station would not survive, Henry-G066, Jim-G067, and Jack-G068 escorted surviving crew members to the station’s lifeboats. The Spartans’ lifeboat landed on Mauritania, Africa, and its occupants were stranded. After the end of the war, the UNSC was able to locate and recover the Spartans and the other soldiers.
The Human-Covenant War left many civilians homeless. Paradiso was one of the newly-discovered habitable planets suitable for refugees. In the year 2556, Henry-G066, along with Jim-G067 and Jack-G068, was sent to the planet with a set of refugees to ensure their safety from potential insurrectionist or Covenant attacks. They arrived on November 20, where they met up with Dom-094, who was already on Paradiso to watch over the first set of refugees.
Jim-G067, Seung-ah-G218, and Henry-G066 fight off Covenant forces
Just three days after the SPARTAN-IIIs' arrival, a small fleet of Covenant Loyalists led by brutes attacked the colony. The combination of the SPARTANs and a greater number of UNSC Army and Marine ground forces annihilated the Covenant ground forces. However, the brutes were able to successfully raid a camp that was not well-guarded, kidnapping Gunnery Sergeant Yoon Hyeon-ki, his surviving men, and the civilians at the camp. The battle in space was also in the UNSC's favor, thanks to the UNSC's greater number of vessels compared to that of the Covenant, forcing the latter's remaining ship, a single battlecruiser, to retreat. The crew aboard the UNSC Frigg was able to track down the Covenant ship and its destination – a world controlled by a relatively small number of Covenant loyalist remnants. Vice AdmiralAlexey Surkov ordered the Frigg and the majority of the Paradiso fleet to pursue in order to finish off the loyalist remnants and rescue the missing humans.
The SPARTANs arrive on the surface of Beimeni. From left to right: Jim-G067, Henry-G066, Dom-094, Seung-ah-G218
Upon arriving at the planet the Covenant escaped to, Surkov's fleet faced another battlecruiser, with the escaping battlecruiser nowhere to be found. Shortly after the UNSC's arrival, the missing battlecruiser emerged from the planet's atmosphere, indicating that it had likely deployed its prisoners at the planet's surface. Surkov ordered the SPARTANs and a division of infantry to search for and rescue the captured humans.
Dom-094 (not pictured), Henry-G066, and Jim-G067 open fire on Tisamenus.
The Frigg's AI, Nótt, located the IFFtransponders of the captured Marines, and the UNSC ground forces subsequently rushed to the location, which was a Forerunner tower. With the Spartans, led by Dom-094, spearheading the operation, the UNSC forces made their way to the prisoners, killing any enemy that stood in their way. Just before the SPARTANs could reach the prisoners, they arrived at the tower's control room, where Tisamenus, the chieftain leading the Covenant forces, waited for them. The chieftain mocked the Spartans by telling them he had already killed one of their kind, even pointing to her armor he had on display in the room. Dom-094, immediately recognizing the armor belonging to Annie-003, nonchalantly ordered Henry-G066 and Jim-G067 to unload theirweapons on Tisamenus. Dom-094 and the two other male SPARTANs, equipped with heavysupportweapons, obliterated the chieftain long before he could reach them with his hammer. Among the chieftain's charred remains, Jim-G067 recovered his weapon, a Tartarus' Gavel. With their biggest threat eliminated, the Spartans proceeded to free the prisoners. Just before leaving the control room, Dom-094 activated the fail-safe detonation system of Annie-003's armor, demolishing pursuing Covenant forces and honoring his deceased former leader.
The UNSC forces escorted the civilians to the nearest extraction, with Jim-G067 in front, plowing through brutes and jackals with his new weapon. Once all UNSC forces evacuated the planet, Surkov ordered the orbital bombardment of the Covenant bases on the surface.
As the oldest of his brothers, Henry naturally gained leadership-like qualities, and was subsequently promoted to lead Team Dao. Earlier in his training, Henry had a tendency to manipulate any situation for his own benefit, which would frustrate his peers whenever they got into trouble. As he grew older, however, Henry matured enough to also ensure the safety of his brothers and his teammates. Contrary to popular belief, Henry is actually the quickest to anger among the Spartans of Team Dao, and therefore succumbs the most easily to the side-effects of the 009762-OO drug. All of his teammates know to give Henry his space whenever he is provoked to rage.
In terms of combat skills, Henry is very proficient overall, performing at least SPARTAN-III-average in all fields. Perhaps what Henry is most notable for is his skill as a Warthog driver, having the awareness and ability to position the vehicle in the best way possible for his allies to take aim.