| 词条 | 21st Helicopter Squadron |
| 释义 | > 21st Special Operations Squadron 2 : Military units and formations established in 1956|Helicopter squadrons of the United States Air Force |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。