Final answer:
If prevailing weather conditions require an alternate for a remote or island destination, the E-8 aircraft will have fuel on board to hold for an extended period of time at the destination fix.
Step-by-step explanation:
In aviation, if the prevailing weather conditions require an alternate for a remote or island destination, the E-8 aircraft will have fuel on board to hold for an extended period of time at the destination fix. The exact duration of the fuel reserve will depend on factors such as the aircraft's fuel capacity, the distance to the nearest suitable alternate airport, and the prevailing weather conditions.