The Pentagon says the military is too stretched to both fight insurgents and prepare for war with great world powers.
President Recep Tayyip Erdogan of Turkey criticized a proposed American-trained force that could put thousands of Kurdish militia on the Turkish border.
When the Islamic State seized territory in Iraq and Syria, it had the time and space to industrialize advanced weapons manufacturing. The results included explosive space heaters and chemical rockets.
He used the largely ceremonial position as a bridge-builder during an intensely violent period in the years after the American-led invasion that toppled Saddam Hussein.
A second service member was injured, the Defense Department said.
President Trump’s former campaign chairman has continued soliciting international business even as his past international work is under investigation.