"When Colubus sailed to the Americas claiming the world was not flat, the two boats that sailed over the edge never had the opportunity to write about their flat earth theory and prove it was flat. Only the three that made it lived"
'The church says the earth is flat, but I know that it is round, for I have seen the shadow on the moon, and I have more faith in a shadow than in the church.'
-Ferdinand Magellan
...oh, and to further annihilate your - and the 'Flat Earth Society's - argument, consider the M-777 Howitzer:
image
Developed & brought into service in 2002. The most advanced artillery piece in existence today.
M-777 Howitzer crews in the US Army/Marines - in calculating where the 155mm round lands (especially via info from the Forward Observation Post) - take into account wind speed, air temperature, and curvature of the Earth, to ensure accuracy of the rounds fired. To omit any one of these factors in their calculations, and it's guaranteed that they'd miss the target.
Now, taking into account what Magellan - as did the ancient Greeks (who calculated & determined that the Earth was spherical way before Christianity even existed) - discovered, and whose facts are used to this day by the US military, who is the liar: the 21st Century US Army/Marines (& thus the US DoD as a whole), with their military science, or God?