optionally piloted vehicle

(US, military, aviation) An aircraft that may be manned or unmanned, able to function in either mode without modification.

Japanese Meaning

有人運転および無人運転のどちらも可能な航空機、すなわち必要に応じて有人または無人で運用できる航空機

The optionally piloted vehicle completed its reconnaissance mission after switching from autonomous to piloted control.

有人・無人両用の航空機は自律飛行から有人操縦に切り替えて偵察任務を完了した。

Sense（1）

(US, military, aviation) An aircraft that may be manned or unmanned, able to function in either mode without modification.

optionally piloted vehicles

（ plural ）