collection of traditions, songs, poems, anecdotes, and facts about the academy, the army, the Old Corps, and the rivalry with Navy that all plebes must memorize during cadet basic training. During plebe year, plebes may be asked, and are expected to answer, any inquiry about plebe knowledge asked by upper class cadets. Other knowledge is historical in nature, including information as found in Bugle Notes. However, some knowledge changes daily, such as "the days" (a running list of the number of days until important academy events), the menu in the mess hall for the day, or the lead stories in The New York Times. Each cadet class celebrates at least one special "class weekend" per academic year. Fourth class cadets participate in Plebe Parent Weekend during the first weekend of spring break. In February, third class cadets celebrate the winter season with Yearling Winter Weekend. In late January the second class cadets celebrate 500th Night, marking the remaining 500 days before graduation. First class cadets celebrate three different formal occasions. In late August, first class cadets celebrate Ring Weekend, in February they mark their last 100 days with 100th Night, and in May they have a full week of events culminating in their graduation. All of the "class weekends" involve a formal dinner and social dance, known in old cadet slang as a "hop," held at Eisenhower Hall. Grant Hall, formerly the cadet mess hall at West Point, is now a social center. Athletics Since 1899, Army's mascot has officially been a mule because the animal symbolizes strength and perseverance. The academy's football team was nicknamed "The Black Knights of the Hudson" due to the black color of its uniforms. This nickname has since been officially shortened to the "Black Knights." U.S. sports media use "Army" as a synonym for the academy. "On Brave Old Army Team" is the school's fight song. Army's chief sports rival is the Naval Academy due to its long-standing football rivalry and the interservice rivalry with the Navy in general. Fourth class cadets verbally greet upper-class cadets and faculty with "Beat Navy," while the tunnel that runs under Washington Road is named the "Beat Navy" tunnel. Army also plays the U.S. Air Force Academy for the Commander-in-Chief's Trophy. In the first half of the 20th century, Army and Notre Dame were football rivals, but that rivalry has since died out. Notre Dame beat Army 44