Amid a crew morale crisis, the military has replaced the U.S.S. Abraham Lincoln in the Middle East with another aircraft carrier. Our Pentagon reporter John Ismay, a Navy veteran, explains how the challenges to supply ships in the area will most likely remain the same.

The U.S. military said its attacks against Iran were in response to a threat to the Strait of Hormuz.

The aircraft carrier has been deployed for nine months, largely in support of U.S. operations against Iran, and is now heading home to San Diego.

Diego Garcia, a tiny island 2,200 miles from the Gulf of Oman, took over as the Navy’s logistics hub after Iran damaged a base in Bahrain.