A heavily-armed government military organization and the first line of national defense. All forces are controlled by a central Commander who answers directly to the President. The organization employs many soldiers and special operatives, among them Rouge the Bat and Shadow the Hedgehog.

Most autonomous GUN robots are powered by Chaos Drives, but larger machines require one or more human pilots. Ground troops wear camouflage and carry survival knives and basic guns. Official military vehicles include: jeeps, humvees, motorcycles, helicopters, at least one inordinately large big rig, and bipedal combat walkers called Jump Vehicles and Cannon Vehicles. The GUN arsenal includes at least a dozen different types of firearms, including: pistols, submachine guns, semi-automatic rifles, heavy machine guns, Vulcan gatling guns, grenade launchers, bazookas, tank cannons, anti-tank missile launchers, rocket launchers (4 and 8 shot), and optic laser rifles.

:: GUN robots ::

Beetle Series ビートルシリーズ GUN's simplest robots, small hovering machines armed with basic weapons. Mono Beetle (モノビートル) -- The most basic Beetle. They have no form of offense and simply hover in midair waiting to be destroyed. Gun Beetle (ガンビートル) -- Beetles armed with guns that fire very, very slowly. Bomb Beetle (ボムビートル) -- These Beetles drop bombs of various sizes. Gun Wing (ガンウイング) -- Gun Beetles with wings for strafing attacks. Bomb Wing (ボムウイング) -- Bomb Beetles with wings for strafing attacks. Spark Beetle (スパークビートル) -- Mono Beetles capable of defending themselves with electric barriers. Spring Beetle (スプリングビートル) -- Mono Beetles with springy helmets ideal for grabbing some sky. Gold Beetle (ゴールドビートル) -- Rare Beetles that only appear for a few brief seconds once per Action Stage. Destroy them for huge score bonuses. :: Sonic Adventure 2 | Shadow the Hedgehog Hawk Series ホークシリーズ Bulky airborne mechs that specialize in ambush tactics. They like to drop down from the sky right in your face. Gun Hawk (ガンホーク) -- Basic Hawks armed with slow-firing guns. Laser Hawk (レーザーホーク) -- Gun Hawks armed with rapid-fire laser rifles. Gum Hawk (ガムホーク) -- Gun Hawks armed with goo-firing cannons. The goo doesn't inflict damage, but will momentarily stun its victim - long enough for the Hawk to charge. Sky Hawk (スカイホーク) -- Gun Hawks outfitted with wings for strafing attacks. Bomb Hawk (ボムホーク) -- These Hawks, found only in Sonic Rush, fly overhead and drop missiles down upon hedgehogs and kitties passing beneath. :: Sonic Adventure 2 | Sonic Rush Hornet Series ホーネットシリーズ Aggressive aerial mechs loaded with explosive missile pods. They fling pods off in clusters when approached. Hornet-3 (ホーネット3) -- Basic Hornets armed with 3 pods. Hornet-6 (ホーネット6) -- Hornets armed with 6 pods. Hornet-9 (ホーネット9) -- Hornets armed with 9 pods. Laser Hornet (レーザーホーネット) -- Hornet-3's armed with laser pods. They won't fling the pods at all but stand around firing relentlessly. Phoenix (フェニックス) -- Red version of Hornet-3. If there's any difference in attack patterns, I can't tell what it is... :: Sonic Adventure 2 Hunter Series ハンターシリーズ GUN's only bipedal robots make for well-rounded if highly generic foes. Gun Hunter (ガンハンター) -- Basic Hunters that stand in place and fire yellow or blue bullets. Yellow bullets inflict damage while blue bullets momentarily stun your character. Laser Hunter (レーザーハンター) -- Gun Hunters armed with rapid-fire laser rifles. Shield Hunter (シールドハンター) -- Laser Hunters armed with large shields. :: Sonic Adventure 2 | Sonic Rush Rhino Series リノシリーズ Heavily-armored mechs that roll slowly along the ground and charge when approached. Rhino Jet (リノジェット) -- Most basic Rhino form. Looks more dangerous than it actually is. Rhino Cannon (リノキャノン) -- Rhino Jets armed with cannons. Rhino Spike (リノスパイク) -- Rhino Jets covered with thick, menacing spikes. Rhino Metal (リノメタル) -- These chunky Rhinos are difficult to destroy and can easily push lightweight heroes off ledges. Best avoided altogether. Rhino Spring (リノスプリング) -- These Rhinos, found only in Sonic Rush, have springy armor that catapults any attackers (or victims) into the air. Spin Dash into them 3 times to destroy them. :: Sonic Adventure 2 | Sonic Rush No image Trooper Bulky, sturdy combat mechs. GUN Trooper (GUNトルーパー) -- Heavy-duty combat mechs armed with assault rifles. Giga Trooper (ギガトルーパー) -- Beefier, sturdier version of GUN Trooper. :: Shadow the Hedgehog

:: GUN vehicles ::

B-3x Hot Shot A lumbering combat walker designed for the defense of high-security locations. Part of the Spider platoon. Combat Weight: 116,800lb Dimensions: Length: 16.5ft Width: 19.2ft Height: 18.1ft Power plant: GUN F-series Diesel Engine Two GUN R-series turbofan engines Speed: Road: 42mph Air: 98mph Armament: One 200mm Long-Range Beam Cannon One M-32A1 22mm Gatling gun Two four AIM-120C Advanced Medium-Range air-to-surface missiles Crew: One Protection: Chobham-type armor on glacis and turret; armored bulkheads between turret and engine Depleted uranium armor in production Automatic fire detection and suppression Collective overpressure Nuclear, Biological, and Chemical (NBC) protection G/VDR-1A radiological warning device :: Sonic Adventure 2 No image Big Foot Slow, lumbering combat walkers. Big Foot Type A (ビッグフット タイプA) -- Large, lumbering combat walkers armed with gatling guns. Big Foot Type B (ビッグフット タイプB) -- Identical to Type A, but armed with missile launchers. :: Shadow the Hedgehog No image Blue Falcon ブルーファルコン A large, disc-shaped hovercraft developed 50 years ago based on the similar Heavy Dog. It's identical to the earlier model, but much faster. :: Shadow the Hedgehog No image Diablon ディアブロン An emergency defense mech piloted by the GUN Commander himself. It's armed with a powerful laser eye beam and a devastating energy pulse that covers a wide radius. It's still in the developmental stages and its attacks take a while to charge. :: Shadow the Hedgehog F-6t Big Foot A lumbering combat walker designed for anti-terrorist operations. Part of the Scorpion platoon. Combat Weight: 100,600lb Dimensions: Length: 16.0ft Width: 19.2ft Height: 18.1ft Power plant: GUN F-series Diesel Engine Two GUN R-series turbofan engines Speed: Road: 45mph Air: 98mph Armament: One M-32A1 22mm Gatling gun Two four AIM-120C Advanced Medium-Range air-to-surface missiles Crew: One Protection: Chobham-type armor on glacis and turret; armored bulkheads between turret and engine Depleted uranium armor in production Automatic fire detection and suppression Collective overpressure Nuclear, Biological, and Chemical (NBC) protection G/VDR-1A radiological warning device :: Sonic Adventure 2 Fighter Series ファイターシリーズ GUN's fighter jets. There's only one model. Blue Eagle (ブルーイーグル) -- Fighter jets that fly overhead and strafe the ground with bombs. :: Sonic Adventure 2 No image Heavy Dog ヘビードッグ A large, disc-shaped hovercraft developed 50 years ago. The Heavy Dog's unique design enables it to attack in 360 degrees with homing missiles, time bombs, and shockwave bursts. :: Shadow the Hedgehog R-1/A Flying Dog Combat Weight: 89,800lb Dimensions: Length: 11.9ft Width: 15.6ft Height: 11.4ft Wingspan: 3.6ft Power plant: Seven GUN R-series turbofan engines Two GUN RX-01 turbofan engines with afterburners Speed: 160mph Thrust: R1-B/C, 16,000 pounds each engine Ceiling: 32,000ft Range: 2,400 miles Armament: One 200mm Long-Range Beam Cannon One M-32A1 22mm Gatling gun Two four AIM-120C Advanced Medium-Range air-to-surface missiles External stations can carry up to conventional air-to-air and air-to-surface munitions and electronic countermeasure pods Crew: R1-A: one R1-B/C: two :: Sonic Adventure 2