What innovative packaging feature was specifically developed for the M1 Garand rifle that revolutionized military equipment distribution during WWII?

The M1 Garand rifle was a game-changer in military history, becoming the standard-issue service rifle for U.S. forces during World War II. Its innovative design and manufacturing represented a major leap in military product development. This poll tests your knowledge about this iconic firearm's packaging and distribution innovations that helped shape modern military logistics.

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Vacuum-sealed cosmoline wrapping that prevented rust for up to 7 years in storage
Disposable wooden crates that could be repurposed as field fortifications
Color-coded parts packaging system that enabled field assembly without training
Self-heating containers that prevented freezing of lubricants in Arctic conditions