There are several place that atmospheric pollution is counted. This article talks about how military related emissions are not taken into account due to bureaucracy:

The Kyoto Protocol originally intended to account for military emissions. But the U.S. successfully pushed to exempt them. The U.S. later failed to formally ratify the treaty.

The 2015 Paris Agreement technically removed the exemption for military emissions. But it didn’t require countries to report them, either — making it voluntary instead.