This is from a mom on the USNA net as she relayed from her son.

A few of us Plebes in 12th Company made the sign from twelve blue magnets (blankets). Then, 7 of the Second Class went to West Point a few times before to Recon. Four Second Class went up to West Point on Parents Weekend for the parade, slept on the roof of their dining hall the night before, and finally unfurled the sign during their Formal Parade.

Although they were caught, and interrogated by a Sergeant Major (E-9 in the Army), they never broke and when West Point learned that the Recon had been approved by Colonel Allen (Commandant, USNA), they released them.
So...Three hours after being captured, they returned to the Naval Academy and were personally recognized by Captain Parker (Deputy 'Dant) for Recon Excellence.

Go Navy! Beat Army!