Civil Computer Electronics BCE-I/I BCE-I/II BCE-II/I BCE-II/II BCE-III/I BCE-III/II BCE-IV/I BCE-IV/II BCT-I/I BCT-I/II BCT-II/I BCT-II/II BCT-III/I BCT-III/II BCT-IV/I BCT-IV/I BEX-I/I BEX-I/II BEX-II/I BEX-II/II BEX-III/I BEX-III/II BEX-IV/I BEX-IV/II