What does RJA stand for?

Radiant Marine - NCIC boat manufacturer code (NCIC)

Ramjet Addition (AAG)

Redman/Johnson Associates, Ltd. - Commercial firm

Reform Jewish Appeal (EA)

Remote Junction Alarm (SAUS)

Retail Jewelers of America - Later, JA (EA)

Ron Joseph and Associates, Inc. - Commercial firm

Rotary Joint Assembly

Royal Jersey Artillery - Military unit - British

Royal Jordanian - ICAO designator (FAAC)

Russko-Jewrejsky Archiw - A publication (BJA)