If Biden and the military were in communication why didn't Biden mention the new vaccine yesterday when he gave a press conference regarding his actions against Covid in the coming weeks? He said he was going to send out 500 million tests. He said the unvaccinated were going to have a rough time. But he never thought to mention that the Army would be announcing a new vaccine the very next day?

No. He didn't know about it.

edit: changed incommunicado to in communication because I'm dumb.

If Biden and the military were incommunicado why didn't Biden mention the new vaccine yesterday when he gave a press conference regarding his actions against Covid in the coming weeks? He said he was going to send out 500 million tests. He said the unvaccinated were going to have a rough time. But he never thought to mention that the Army would be announcing a new vaccine the very next day?

No. He didn't know about it.