WW2 'Q' DEMS Arm Badge (2nd Pattern) From £5.00 Reproduction. WW2 Style. Machine embroidered cotton on a felt backing. Manufactured by Monty's Locker. Worn by RA Gunners attached to DEMS (Defensively Equipped Merchant Ships). Worn as a formation badge on both upper arms by former Anti-Aircraft Command personnel following the name change to The Maritime Regiment RA.