There are two notable contexts for "Heavy Mettle":
- The animated cult classic movie "Heavy Metal" was released on August 7, 1981, in theaters. It is a Canadian adult animated science fantasy anthology film with a strong following since its release.
- The video game update "Operation Heavy Mettle" for Rainbow Six Siege was released on August 29, 2023. This update includes a new operator named Ram, gameplay changes, and new game modes.
If referring to the movie, it started in 1981 in August. If referring to the Rainbow Six Siege game operation, it started in late August 2023. Please specify if the query is about the movie or the game update for more details.
