You ever had a concussion? Ever been a soldier who has the mindset of "shut up and ruck up" over what they might consider minor injuries at the time? Ever put your life in the hands of military medical folks who aren't specifically trained to look at concussions until the symptoms are so evident they have to deal with it?
Concussion symptoms sometimes won't manifest for days after an event. The President made the announcement less than 24 hours after the attack. A lot of Soldiers would work through what they might think are minor injuries or "I just got shook up" because of an ingrained sense of duty and avoiding the perception they are sandbagging the unit as a whole. Such injuries might not have even been reported for some time afterwards and even then, military medicine isn't the best at diagnosing the problems and toss Motrin at it first and foremost. Furthermore, a lot of those people on that base are Special Operations Forces who work through and deal with pain each and every day because they know the mission has to get done and a little pain isn't going to deter them.
Before you go calling out the President for wrongdoings, you might want to consider and know the source of such people that were injured and whether or not they would actually report such injuries or get treated until way later. Combat ain't a football game where they take your helmet and let you watch from the sidelines with a towel over your head. Soldiers will work through such things until the job is done.