Founded by survivors of the Black Mesa, and notorious for it's bright minds, manpower and famous ability to jury rig Combine technology. The Lambda is regarded as the first, original movement dedicated to the direct opposition of Combine rule over Earth. After the death of Eli Vance, the next leader was elected by those stationed at the White Forest Base to lead the organization past it's troubles.

Marching onward guided by ideals of democracy, personal freedoms and liberty the Lambda swept through Combine strongholds in the East - sacking forts and occupying outposts which were slowly used to expand the frontier of Lambda borders. It is held in strong regard by a large portion of Earth's population.