Despite a civil war and the COVID-19 pandemic, Yemen remains a crossing point for tens of thousands of East African migrants headed for Saudi Arabia. When laid out on the deck of the Monterey, the scale of the find came into focus. Sailors found nearly 3,000 Chinese Type 56 assault rifles, a variant of the Kalashnikov. They recovered hundreds of other heavy machine guns and sniper rifles, as well as dozens of advanced, Russian-made anti-tank guided missiles. The shipments also included several hundred rocket-propelled grenade launchers and optical sights for weapons. The Navy’s Mideast-bas...