In Transportation
in aircraft:
- Hughes OH-6 Cayuse, a 1963 American scout helicopter
- MD Helicopters MH-6 Little Bird, a special forces variant
- Xian H-6, a Chinese bomber
- Besson H-6, a French flying boat
- Sikorsky R-6, an 1943 American helicopter
in watercraft:
- HMS H6, a British submarine
- USS H-6 (SS-149), a United States submarine
- HMS Hurricane (H06), a British Havant class destroyer
- HMS Keith (H06), a British B-class destroyer
Read more about this topic: H6