The Council on Foreign Relations estimated 26,172 bombs in seven countries in 2016 alone, and called that low. The X post's "single year" is right. The Reddit version's "during Obama's terms" undersells the total.
CFR's Micah Zenko and Jennifer Wilson put 12,095 in Iraq and 12,192 in Syria, estimated from the U.S. share of coalition strikes. They call the total "undoubtedly low." The post's 26,171 is one short of CFR's current figure, which added a late-reported Yemen strike1.
We found no official total for both terms. CFR estimated 23,144 for 20152, so its two years alone total 49,316, by our sum. Separately, strikes in Pakistan, Somalia and Yemen, mostly by drone, numbered 563 over two terms, against 57 under George W. Bush3.
The 2016 peak came from the fight against ISIS. Iraq and Syria took 93% of the bombs, by our calculation from CFR1. The pace rose in calendar 2017, mostly Donald Trump's first year: coalition weapons in Iraq and Syria went from 30,743 to 39,577, and weapons in Afghanistan from 1,337 to 4,3614.