A US military refueling plane crashed in Iraq, killing 4. Here’s what to know

The U.S. military says a KC-135 refueling aircraft supporting operations against Iran crashed in western Iraq, killing four of its six crew members.

The U.S. Central Command, which oversees the Middle East, said the crash followed an unspecified incident involving two aircraft in “friendly airspace,” and that the other plane landed safely.

Here’s what is known so far about the tanker, which is the fourth publicly acknowledged U.S. aircraft to crash during the war against Iran:

The KC-135 is a long-serving tanker plane

The KC-135 Stratotanker is a U.S. Air Force aircraft used to refuel other planes in midair, allowing them to travel longer distances and maintain operations longer without landing. The plane is also used to transport wounded personnel during medical evacuations or conduct surveillance missions, according to military experts.

Based on the same design as the Boeing 707 passenger plane, the tanker has been in service