Can you detect the 21 Rocket names hidden in these lines of verse ?

1. In Devon it's treacle & clotted cream on a scone; but elsewhere it's inclement weather & you need to rush home.

2. This has a factor for its level when explored, the inner diameter of a gun but it sounds like a sword.

3. Sphyraenidae Perciform you'll find in Hawaii; but under the water and not in the sky-ee.

4. Not thin but thin & you could listen for hours; omit thin 'Halfway between The Gutter and The Stars'

5. Moby Dick is instantly brought to mind; but this is a missile of a Navy kind.

6. Sounds like burning sports kit & that's not nice; but found at weather stations on the Polar ice.

7. With a strenuous effort you may try; to launch Captain Cook's ship up into the sky.

8. Load it carefully or it might crash; but if it does it will fly again up from the ash.

9. Up into the sky this one goes sizzling; but it could be used for Totem Pole chiselling.

10. A flag has no choice on a becalmed galleon; or it could be otherwise an untamed stallion.

11. This long rocket is highly rated; seen in the desert when you're dehydrated.

12. This can be found with a rebel's tag; launched of course with a skull & crossbones flag

13. This rocket has many a fan; but Cruise was the last one in Japan.

14. Sleek in car & cat is this; high altitude power & that is bliss !

15. Robin Williams fell into this game and from this you will easily know its name.

16. Though M- capable, this one's in-your-face; and really sounds a tough hard case !

17. This is a mesmerizing snake in Outer Space and it launches at a rattling pace.

18. This might be your answer if you were a male sheep but this one goes off the stand with a leap !

19. This might be an American desert bird-of-prey but it sure is elegant when it launches away.

20. Unwanted guest ? Call 999 or 911; no this is much wanted & will give plenty of fun!

21 This sounds like it might be a pest but like Dennis this is one of the best !