It replaces this, which is the USAF badge as the RAF didn’t have one. They’ve been wearing these for many a year at RAF Fylingdales, Vandenberg AFB and the Space Ops Centre (SpOC) at RAF High Wycombe.
Here is a Corporal receiving one having completed the Space Operators Course in the USA.
https://www.raf.mod.uk/news/articles...space-command/
So really this is fine. The normal rules in QRs applies, in that you wear the badge for which you are qualified for, if you’re in staff then you take your pick which one you want to wear if you qualified for it. It’s not a flying badge either, so if you are flying then it will subservient to any flying badge. Times move on and it was about time we stopped wearing USAF badges.