Before revision: In April 2009 there were 11 TTCP Groups: Aerospace Systems Group Chemical, Biological & Radiological Defence Group (CBR) Conventional Weapons Technology Group Command, Control, Communications & Information Systems Group (C3I) Note that although C3I is more commonly used as an abbreviation for Command, Control, Communications Intelligence, in the case of TTCP, the I abbreviates "Information".
After revision: In April 2009 there were 11 TTCP Groups: Aerospace Systems Group Chemical, Biological & Radiological Defence Group (CBR) Conventional Weapons Technology Group Command, Control, Communications & Information Systems Group (C3I) Intelligence, in the case of TTCP, the I abbreviates "Information".