Military electronic systems. The Puma 2 Gazelle Project Team invites Expressions of Interest from suppliers for the provision and through life support of a Mission Support System (MSS) for the Puma HC2 helicopter fleet. The capability will consist of a Mission Support System which incorporates both a Mission Planning System (MPS) and a Mission Management System (MMS). This equipment is envisaged to be operated at a 'Secret' Level and as such the successful company must be willing to, if not already held, obtain List X Accreditation prior to Contract Award. It is envisaged that a maximum of six suppliers will be invited to negotiate. A pre-qualification exercise may be held prior to issuing an Invitation to Negotiate. The Authority seeks to place a Through Life Procurement and Support Contract until 31 Mar 2025.