Is Half-Life: Opposing Force Canon?

An analysis of the strange status of Half-Life: Opposing Force in its parent series. — Bonus Video: Written, recorded, and edited by me. Music is from the Half-Life OST (), Half-Life: Opposing Force OST, and Half-Life: Alyx OST(). 0:00 - Introduction 1:05 - Background 2:00 - Subjective “Evidence“ 2:46 - Plot and Pacing 4:27 - Marc