What is CCF? What CCF stands for?

Christian Children's Fund
Co-operative Commonwealth Federation
Computing & Communication Foundations
Campus Christian Fellowship
Cambridge Conservation Forum
Cheetah Conservation Fund,
Christ's Commission Foundation
and so on which one do you want

Combined Cadet Force.

Combined Cadet Force

one possible meaning would be combined cadet force. As in army cadets etc. Some colleges/universities have these.

There are dozens of possible meanings. You'll have to provide more information.