What type of Marine weapons systems includes small arms and crew-served weapons?

The correct choice pertains to the classification of various Marine weapons systems. Major Weapons Systems encompass a broad range of weaponry utilized by the Marine Corps, including both small arms, which are typically handheld firearms, and crew-served weapons, which are operated by a team and generally fire larger caliber ammunition. This classification captures the significant diversity within the weapons used by Marine forces, emphasizing those essential for infantry roles and direct engagement scenarios.

In contrast, options like Amphibious/Infantry Vehicles focus more on the platform of transport and mobility rather than the actual weapons employed. Artillery Systems are specific to larger caliber, long-range weapons that are not considered small arms or crew-served in the traditional sense. Rotary Wing Aviation involves aircraft operations, primarily helicopters, and while they may be equipped with weaponry, they do not fall under the category of small arms or crew-served weapons like those categorized in Major Weapons Systems. Thus, the focus on both small arms and crew-served weapons makes it clear why this answer correctly reflects the desired classification of Marine weaponry.