Which type of helicopter is primarily used for combat missions against marine targets?

The Helicopter Maritime Strike (HSM) is specifically designed and equipped for combat missions, particularly against naval and marine targets. This type of helicopter is used to support anti-surface warfare operations and has the capability to engage in both offensive and defensive roles. It is fitted with advanced avionics, weaponry, and sensors that make it highly effective for tasks such as escorting naval ships, conducting surveillance, and engaging enemy maritime forces.

In contrast, other types of helicopters serve different primary purposes. Helicopter Sea Combat focuses more on search and rescue, anti-submarine warfare, and logistical support. Helicopter Training is not intended for combat but rather for teaching and skill development of personnel. Helicopter Observation is primarily focused on reconnaissance and surveillance rather than direct combat capabilities. Therefore, the Helicopter Maritime Strike plays a crucial and defined role in combat operations against marine targets, making it the correct answer.