Development and functional relationships CEMA serials need to become a part of regular training programmes 3 v. Expeditionary forces. Expeditionary force design should take account of CEMA from inception. 30 The practice of retro-fitting CEMA force elements into a conventional force may lead to under-resourcing, unclear or complex chains of command and poor integration into a full spectrum approach. vi. Lead user. While the role of lead user for tactical CEMA capabilities can be placed within a single Service, the default for the lead user role is the C4ISR joint user in JFC. This may be the case even if the capability is operated by a single Service. vii. Joint user. This role should always stay with the C4ISR joint user in JFC. As CEMA is focused on synchronisation, coordination and the contribution to the full spectrum approach, the C4ISR joint user will have the remit to look across Defence. viii. Lead delivery agent. This may sit with either Defence Equipment and Support (DE&S) or Information Systems and 30 This is to include planning staff. JDN 1/18 29