2-77 MQF Fire Support Team (FIST) Certification Practice Test 2026 – The Comprehensive All-in-One Guide to Master Your Certification!

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During the time portion, if two airbursts and two graze bursts are observed, the HOB correction is Up by how much?

No correction is required.

Up 20

Up 40

Up 10

Height of Burst (HOB) corrections are about where the fuse detonates relative to the target. In the time portion you interpret the burst pattern to judge whether the detonation height is too high or too low. An airburst indicates the shell is detonating higher in the air than desired, while a graze burst indicates a detonation closer to the ground. When you observe two airbursts and two graze bursts, the guidance table for HOB corrections prescribes a small upward adjustment to bring the burst center toward the target area. That specific mix calls for up by 10, meaning increase the height of burst by 10 units and reassess.