City under Storm Clouds — Green

1440 × 900

Half-Life 2 soldier

1920 × 1080

Half-Life 2 city assault

1280 × 1024

Soldier in Gas Mask — Black, Dramatic, Night, 3d Render, Gas Mask

1024 × 768

Half-Life: Alyx promotional art

1600 × 1200

Man and Woman in Armor — Gray, Dramatic

2560 × 1440

Four Soldiers in Gas Masks — Black, Dramatic, Digital Art, Gas Masks

1680 × 1050

Giant Robot in City — Gray, Dramatic, Digital Art, Skyscrapers

1920 × 1200

Power Armor Helmet — Gray, Dramatic, 3d Render, Clouds, Smoke

1920 × 1080

Two Characters Standing — Red, Dramatic, 3d Render, Logo

1280 × 1024

Power Armor Soldier — Helmet

1280 × 960

Soldier in Desert — Orange, Dramatic, Sunset, Digital Art

1920 × 1080