The cost of the U.S. campaign against ISIS has passed $1 billion, experts say

Experts estimate that the cost of America's military campaign against ISIS has passed $1 billion.

Estimates from the Pentagon suggest the U.S. air operation in Iraq, which began on June 16 and included surveillance flights, cost $7.5 million each day. When bombings began on Aug. 8, the Pentagon estimates, the daily cost of America fighting ISIS rose to $10 million. Based on those daily costs alone, the estimate would now be $937 million, NBC News reports.

When the 47 Tomahawk missiles the U.S. fired on the first night of the Syria airstrikes are added to the estimate, it comes out to more than $1 billion. The missiles cost at least $1 million each, according to NBC News.

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On Tuesday, the military said that the U.S. conducted 11 airstrikes in Syria over a two-day period. The military reported that the U.S. has conducted more than 200 airstrikes in Iraq, and the U.S. and its Arab allies have conducted more than 60 airstrikes in Syria.