Jock - I was talking to a bloke who was 1 Royal Hampshires and did their 76-77 tour, he mentioned about an 18 year old who was shot by a UDR soldier in Maghera in 1976.
Checking the NIVA archives I found a Dmr Fallows but he is listed as 1 Cheshires and being killed in Magheralin.
The bloke confirmed the details - the young lad was taking over stag and there was an 'occurrence' with an SMG that was being handed over.
As a result the young man was killed instantly.

24318969 Drummer Frank Arnold Fallows (18) 1 Royal Hampshire Regiment - fatally shot accidentally at Maghera RUC station, 10/11/1976.

For your information.