Availability for mobilisation is dependant on a number of factors, in particular which section of the Reserve Forces Act 1996 is being used to make a Call-Out Order. Therefore, while reservists may be unavailable for mobilisation under one section of the Act, they will be available under another. This effectively means that nearly all reservists remain available for mobilisation.
As at 30 September 2008 the following Volunteer Reserve personnel were available for mobilisation:
Royal Navy Reserve: 2,077
Royal Marines Reserve: 858
Territorial Army: 28,920
Royal Auxiliary Air Force: 1,599
These figures exclude those serving on full time reserve service and members of the sponsored reserve.