Which of the following describes a situation where a vehicle cannot move but can still fire?

A situation where a vehicle cannot move but can still fire is described as a mobility kill. This term is used in military contexts to indicate that while the vehicle's ability to maneuver has been compromised, it retains the capacity to engage targets using its weapon systems. This can occur due to various factors, such as damage to the vehicle's drivetrain or suspension, which prevents movement but does not impair its weaponry.

In contrast, other options refer to different statuses of vehicle damage. A firepower kill indicates that the vehicle cannot fire because its weapons systems are incapacitated, while a combined firepower mobility kill suggests issues with both mobility and firepower, limiting the vehicle's operational capabilities on multiple fronts. A catastrophic kill denotes a total destruction of the vehicle, meaning it cannot move or fire. Thus, the term mobility kill precisely captures the situation described in the question.