What must fuel levels be in vehicles being sling loaded?

The correct answer is that fuel levels in vehicles being sling loaded must be 75% or less. This requirement is crucial for safety reasons during air transport operations. Limiting the fuel to no more than 75% minimizes the risk of fire or explosion during sling loading, especially when the vehicle may encounter turbulence or other stresses during the flight.

Additionally, having a controlled amount of fuel helps reduce the overall weight of the load, which is important for stability and maneuverability of the aircraft. It also decreases the likelihood of spillage, which can create hazards both in transit and upon landing. Understanding these regulations helps ensure that air assault operations are conducted safely and efficiently.