List of minor HECU members
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 Santego Military Base
Opposing Force’s training chapter, Boot Camp, begins in Adrian Shephard's barracks in the Santego Military Base where Senior Drill Instructor Dwight T. Barnes introduces himself. Shephard and seven other recruits are standing at attention in front of their beds and trunks. Each trunk bears the name of the recruit it belongs to, most being references to the Gearbox employees who developed the game.
- B. Martel: A reference to Brian Martel. Martel's name was also referenced to for a Black Mesa scientist in Decay.
- D. Mertz: A reference to David Mertz. Mertz's name was also referenced to for a Black Mesa scientist in Decay. David Mertz was the designer for the Santego Military Base levels, his signature left hidden in the map
ofboot0in one of the closed barracks rooms. In the game, his recruit character appears to be from Texas, as mocked by Barnes: "Where are you from, soldier? Texas? Holy cow! You know what comes from Texas, don't you?".
- J. Faulkenbury: A reference to John Faulkenbury. He is not present at the time of Boot Camp.
- L. Montgomery: A reference to Landon Montgomery. Montgomery's name was also referenced to for a Black Mesa scientist in Decay.
- M. Wardwell: A reference to Mike Wardwell. Wardwell's name was also referenced to for a Black Mesa scientist in Decay. He is not present at the time of Boot Camp.
- P. Deupree: A reference to Patrick Deupree. Deupree's name was also referenced to for a Black Mesa scientist in Decay.
- R. Heironimus: A reference to Rob Heironimus. Heironimus' name was also referenced to for a Black Mesa scientist in Decay.
- R. Pitchford: A reference to Randy Pitchford. Pitchford's name was also referenced to for a Black Mesa scientist in Decay.
- S. Bahl: A reference to Stephen Bahl. Bahl's name was also referenced to for a Black Mesa scientist in Decay.
 Goose 7 and crash site
The introduction chapter of Opposing Force, Incoming, begins with Adrian Shephard and his squad being flown to the Black Mesa Research Facility in the Osprey Heliplane codenamed Goose 7. After their transport is attacked and crash lands, Shephard briefly witnesses other scattered military forces battling aliens near the wreckage.
Benny (entity name) is a soldier seen during Opposing Force’s introduction chapter.
After Goose 7 crashed, Shephard saw a wounded Benny attempting to run away from a Vortigaunt. He was unable to escape, however, and an energy beam stuck him in the back. Benny is last seen crumpling to the ground as Shephard blacked out.
Jackson is an Engineer and a member of Shephard's squad sent to Black Mesa in Goose 7.
As Goose 7 was traveling to Black Mesa, Jackson briefly joked about Tower's mother and proclaimed he didn't care what their mission was as long as he would be able to kill something. As Tower attempted to draw Shephard into the argument, the Osprey flying alongside them, Goose 3, was shot down by an Alien Craft. Shortly afterward, Goose 7 was attacked as well, causing it to crash.
Johnson (entity name) is a Medic seen during the introduction chapter.
In the ensuing chaos after Goose 7 went down, Johnson brought an unconscious Shephard to safety away from the crash site. Shephard briefly awoke to see Johnson calling out a warning to Benny of impending danger. As he blacked out again, he last saw the Medic rushing to Benny's aid. When Shephard returns to this area later on, he finds the Vortigaunt dead with a Combat Knife in its back, implied to have been used by Johnson.
Private Tower is a member of Shephard's squad sent to Black Mesa in Goose 7. He is seen carrying a Submachine Gun and an ammo belt. When he questions the unexplained secrecy of their mission, Tower is berated by the commanding sergeant on board the Osprey. Shortly afterwards, their aircraft is attacked and crash lands.
Later on in his journey through Black Mesa, Shephard finds the members of Team X-Ray Zulu, all KIA. However, their radio is still functional, and he overhears a radio transmission from a soldier who has engaged the Pit Worm with his unit. The transmission reveals that Tower survived Goose 7's crash and joined up with a different unit but was then killed, as the commander notes "Tower and Inney are down and I've lost contact with the rest of the squad!".
Tower is also a selectable character model in the multiplayer modes of Opposing Force.
The commander of the operation (voiced by Harry S. Robins) is a character first heard in Half-Life in the chapter Surface Tension. He calls out to Cooper over the radio to request any final air strikes on the Tactical Map before retreating to safety, a transmission heard by Gordon Freeman. He is seen in person by Adrian in Opposing Force during the chapter We Are Pulling Out announcing these orders. Once he finishes, he addresses Adrian and tells him to get down to the hangar for evacuation.
Cooper was an HECU soldier responsible for operating the Tactical Map set up in Waste Processing Area 3 to call down mortars on Black Mesa. His corpse is found by Gordon Freeman during the Half-Life chapter Surface Tension atop a large waste container next to the map and a radio. Cooper's commander attempts to contact him on the radio, telling Cooper identify any last targets before retreating to safety as airstrikes would soon begin. The commander sending this message to Cooper can be seen by Adrian Shephard in the process of transmitting it during Opposing Force in the chapter "We Are Pulling Out".
As heard in a radio transmission in the Opposing Force chapter Vicarious Reality, Inney and his squad (including Tower) had engaged the Pit Worm in the waste sector of Black Mesa and were killed before Shephard arrived. Note: the spelling of this name is unsure as it is only heard in a garbled radio transmission.
|Hazardous Environment Combat Unit|
|Characters||Minor members · Dwight T. Barnes · Sharp · Adrian Shephard|
|Classes||HECU Engineer · HECU Medic · HECU Sniper|
|Weapons||9mm Pistol · Artillery Cannon · Combat Knife · Desert Eagle · Dynamite · Fragmentation Grenade · Gun Emplacement · Land Mine · Laser Trip Mine · M249 Squad Automatic Weapon · M-40A1 Sniper Rifle · Mortar · Submachine Gun · Rocket Cannon · RPG · Satchel Charge · Sentry Gun · Shotgun · Tripod-Mounted Heavy Machine Gun|
|Transportation||AH-64 Apache · Jet · M1A1 Abrams · M2A3 Bradley · M44 cargo truck · Osprey Heliplane|
|Technology||Chargers · Powered Combat Vest · Radio · Tactical Map · Transportation · Weapons|
|Other||Hazardous Environment Combat Unit models · Military Police · Robot Grunt · Santego Military Base|
|Classes (cut)||Human Sergeant|
|Weapons (cut)||20mm Cannon|