New Navy Patch and question

[Capt.Confederacy]

I came across this patch the other day and decided to pick it up given it was one I'd never seen before. I'm assuming that it's from the 31st Naval Construction Regiment. (hence the "NCR"). However, I'm unsure as to time period when it was used or place of manufacture.

 

Can anyone shed some light on these questions?

Thanks.

 

[Capt.Confederacy]

And here's the back of the patch.