Mysterious Building MBCA

Greetings! I’ve been studying the history of buildings at or near Space Park via TRW phone books kept in TRA’s E2 archive. One named “MBCA” has puzzled me because I haven’t seen it mentioned elsewhere. It was shown on maps from 1992 to 2000 in the southwest corner of Rosecrans & Aviation with an address of 3601 Aviation (recently occupied by Fisker, the EV automaker that went bankrupt earlier this year). While it’s tempting to think the abbreviation simply stood for “Manhattan Beach, California,” does anyone know what it actually meant or what kind of business activity TRW conducted there? Thanks in advance,
George