Forward Observers and HQs?

[Akmatov]

It has been a while since I played SPMBT, a couple of versions back in fact, so I am relearning a lot.

Are Forward Observers the only units that can call in Bombardment Missions?

I'm currently playing the Caribbean Crisis Campaign and was startled to find that HQ units are unable to call in Bombardment Missions.

Has this always been this way or am I missing something?

I did look through the manual, but found nothing the answer my question.

Thanks for any info.