The massive Sawmill Fire burned more than 45,000 acres of Tucson land in April of 2017.
"Start packing up! Start packing up!" a voice is heard saying in the video after the explosion.
U.S. Border Patrol agent Dennis Dickey pleaded guilty to starting a fire without a permit.
The intended explosion was detonated as part of a gender reveal party. In this case, Dickey's plan was to shoot a rifle at a target containing Tannerite, a highly explosive substance that would have exploded to reveal either blue powder for a boy or pink powder for a girl.
The video, obtained by the Arizona Daily Star from the U.S. Forest Service through the Freedom of Information Act, is below.
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"I feel absolutely disgusting about it".
Dickey, 37, immediately reported the fire and admitted to being responsible for it, according to a news release from the U.S. Attorney's Office, District of Arizona. It took nearly 800 firefighters at a cost of $8.2 million to extinguish.
He was ordered to pay a $100,000 (£78,000) fine up front and then $500 (£390) every month for the next 20 years.
Exploding targets consist of two ingredients that when mixed by the end user explode when shot by a high-velocity projectile.
Dickey must serve five years' probation and make a public announcement about the cause of the fire, under the conditions of his plea agreement.