Which drop requires a longer PI during the day?

The correct choice indicates that high-altitude, high-opening (HAHO) or high-altitude, low-opening (HALO) drops require a longer parachute in-flight (PI) time during the day due to various environmental factors.

During a high-explosive (HE) drop, the parachutist is usually deployed from a higher altitude and often at higher speeds compared to personnel equipment (PE) drops. This elevated deployment leads to longer fall times, and additional time is needed for the parachutists to navigate to the target area safely, especially when considering factors such as wind drift and visibility during daylight conditions.

Moreover, the additional time required ensures that the jumpers have enough safe altitude for parachute deployment and to stabilize themselves for a proper landing, making it crucial for high-altitude jumps to account for the extended PI time necessary to judge their descent accurately and prepare for landing.

In contrast, personnel (PE) drops typically involve lower altitude releases, which necessitate shorter PI times as the fall rate is higher, leading jumpers to reach the ground faster. This difference clearly underlines why HE drops require a longer PI during the day.