AAC Anti Aircraft Section Shoulder Title

[Smudger 53]

I found this AAS Title in a Job lot from Auction. I am trying to research it but get conflicting info. Is it AA Service or Section please?
Also I have read the crews were made up from RA or RGA Personell. Is this correct?
It is stamped Tiptaft B/ham on the rear.
Did they have a Dedicated Cap Badge or retain their Parent Regt Badge?

As there is not an awful lot of info on the Title, im hoping members may know more.

Any answers to the above would be very much appreciated.
Thank you in advance.