Which factor contributes to the long-term viability of an assault position?

• A. Speed of enemy contact
• B. Height of terrain
• C. Proximity to supply lines
• D. Sustainability

Answer: (D)

Sustainability is the factor that determines how long a position can be held and defended. A position that can be maintained over time has steady access to ammunition, food, water, fuel, medical support, and the ability to rotate troops, repair gear, and recover from casualties. These logistics and supports keep the force effective and resilient as pressures persist.

The other aspects influence short-term conditions or tactical advantage, but they don’t guarantee lasting viability. Speed of enemy contact shapes tempo and initial momentum; height of terrain provides an immediate positional advantage, but without the ability to sustain operations, that edge fades. Being close to supply lines helps, but sustainability explicitly encompasses the ongoing capacity to supply, rest, and replenish, making it the best measure of long-term viability.