To my knowledge, this is the first time a 9/11 memorial by the highest officials has happened on an 11th other than September.

As covered by the Navy Times:

President Obama, Defense Secretary Robert Gates and Joint Chiefs of Staff Chairman Adm. Mike Mullen on Saturday (the 11th) remembered the victims of the terrorist attack on the Pentagon in a ceremony at the Pentagon Memorial.

I can optimistically think that this is in direct response to:

1. The Truth Action campaign for 9/11 truth awareness every 11th of each month
2. Jesse Ventura's upcoming episode of "Conspiracy Theory" focusing on the Pentagon
3. Growing anger about the wars
4. Growing distrust of the official 9/11 story      
5. All of the above

The truth of the Pentagon may not be as obvious as the WTC demolition job in NYC; but none-the-less there are many unanswered questions regarding what did or did not hit the Pentagon, how it hit the Pentagon and why it was allowed to. That doesn't even scratch the surface of the mysterious Pentagon incident on 9/11.

The rhetoric from Obama, Admiral Mullen and Secretary Gates continues below from the same Navy Times article:

“We honor them with our presence and certainly with this memorial,” Mullen said at a Pentagon ceremony for those who died in the building and on the plane that hit it.

“Mostly, we honor them with our lives, with what we have done from that day to this — the sacrifices we have borne, the laughter we have shared, the hope we have dared to let back into our hearts.”

The ceremony included family members of the 184 who were killed in the 2001 attack on the sprawling Defense Department headquarters.

The war to go after al-Qaida — and Taliban leaders harboring them in Afghanistan — is now nine years old.

“Today we also reflect on what those attacks meant for an entire generation of young Americans who answered the call to serve,” Defense Secretary Robert Gates said of the armed forces.

Obama recalled “that awful morning” when “a sorry band of men” who perverted religion attacked the U.S. in hopes of demoralizing and dividing the country.

“Today we declare once more we will never hand them that victory ... for our cause is just, our spirit is strong and our resolve unwavering,” Obama said.

“We will not given in to their hatred,” Obama said, despite the terrorists’ efforts to spark conflicts among faiths. “As Americans, we will not or ever be at war with Islam.”