An F-15 fighter jet and an A-10 attack plane were lost to hostile fire. Two search-and-rescue helicopters also were hit, injuring the crews, before safely returning to their base, officials said.

A plan briefed to Trump last week to insert ground forces to remove Iran’s nuclear material would be a very difficult endeavor of a type never before attempted in wartime.

The findings appear to be the most comprehensive estimates yet of the growing toll of dead and wounded civilians in the month-long war.