Hard rubber hose stored on a hose reel is classified as __________ hose.

Hard rubber hose stored on a hose reel is classified as booster hose. This type of hose is designed for high-pressure applications, and it's commonly used for firefighting because it is lightweight, flexible, and easy to handle. Booster hoses are typically used to quickly combat small fires or as a supplemental line when additional water flow is required. The hard rubber construction allows the hose to maintain its shape while being highly resistant to abrasion and wear, making it ideal for the varied environments encountered during firefighting.

The other types of hose mentioned serve different purposes. Attack hose refers to hoses specifically designed for firefighting operations that deliver water directly to extinguish a fire. Supply hose is intended for transporting large volumes of water from a source to a pump or directly to a water supply for firefighting. Drill hose is used for training purposes and has distinct characteristics tailored for practice, rather than operational firefighting. Thus, booster hose is the correct classification for hard rubber hose stored on a reel.