JOTR and JOE were recently removed, JOCAG is the only NL server download for Joint Operations.
You could try your Joint Operations Escalation key to validate the game, the installer may class a JOE key as a valid one because JOCAG is basically JOE.
JOCAG Installer
ftp://ftp.novalogic.com/C3/kpvsh/
BHD Installer
ftp://ftp.novalogic.com/C3/jfq7rcp/