Veterans.

First, establish eligibility with the Veteran's Administration. (see related links below)

Second, follow the procedure for 'at the time of need'. (see related links below)

The distance from Arlington National Cemetery to Lincoln Memorial is approximately 3 minutes. Getting there requires driving over the Arlington Memorial Bridge.

Thousands; some of note are Audie Murphy, William J. Donovan, Matthew Urban, John F. Kennedy

the oldest grave in the AN cemetery is a grave that was built in 1763. The grave belongs to Jacqueline Harris. Jacqueline Harris was a young lady who died of kidney failure. She lived out a life of seventeen years. You can find her family graves at that same cemetery too. My granny told me that her great-grandmother was friends with Jacqueline, and is proud that she is the oldest grave in the AN cemetery.

becase he was a president

This is because there is a twenty-one gun salute, so for every salute there is a step.

Arlington National Cemetery is administered by the Department of the Army National Cemeteries, a part of the Defense Department of the U.S. federal government.

Arlington National Cemetery covers an area of 624 acres comprising about 300,000 grave sites.

Apparently, no. The main categories seem to be veterans who retired from the Armed Forces, active duty members of the Armed Forces, decorated veterans, and federal politicians. Here are the categories from the cemetery's website:

The persons specified below are eligible for ground burial in Arlington National Cemetery. The last period of active duty of former members of the Armed Forces must have ended honorably. Interment may be casketed or cremated remains. # Any active duty member of the Armed Forces (except those members serving on active duty for training only). # Any veteran who is retired from active military service with the Armed Forces. # Any veteran who is retired from the Reserves is eligible upon reaching age 60 and drawing retired pay; and who served a period of active duty (other than for training). # Any former member of the Armed Forces separated honorably prior to October 1, 1949 for medical reasons and who was rated at 30% or greater disabled effective on the day of discharge. # Any former member of the Armed Forces who has been awarded one of the following decorations: ## Medal of Honor ## Distinguished Service Cross (Navy Cross or Air Force Cross) ## Distinguished Service Medal ## Silver Star ## Purple Heart # The President of the United States or any former President of the United States. # Any former member of the Armed Forces who served on active duty (other than for training) and who held any of the following positions: ## An elective office of the U.S. Government ## Office of the Chief Justice of the United States or of an Associate Justice of the Supreme Court of the United States. ## An office listed, at the time the person held the position, in 5 USC 5312 or 5313 (Levels I and II of the Executive Schedule). ## The chief of a mission who was at any time during his/her tenure classified in Class I under the provisions of Section 411, Act of 13 August 1946, 60 Stat. 1002, as amended (22 USC 866) or as listed in State Department memorandum dated March 21, 1988. # Any former prisoner of war who, while a prisoner of war, served honorably in the active military, naval, or air service, whose last period of military, naval or air service terminated honorably and who died on or after November 30, 1993. # The spouse, widow or widower, minor child, or permanently dependent child, and certain unmarried adult children of any of the above eligible veterans. # The widow or widower of: ## a member of the Armed Forces who was lost or buried at sea or officially determined to be missing in action. ## a member of the Armed Forces who is interred in a US military cemetery overseas that is maintained by the American Battle Monuments Commission. ## a member of the Armed Forces who is interred in Arlington National Cemetery as part of a group burial. # The surviving spouse, minor child, or permanently dependent child of any person already buried in Arlington National Cemetery. # The parents of a minor child, or permanently dependent child whose remains, based on the eligibility of a parent, are already buried in ANC. A spouse divorced from the primary eligible, or widowed and remarried, is not eligible for interment. # Provided certain conditions are met, a former member of the Armed Forces may be buried in the same grave with a close relative who is already buried and is the primary eligible.

See also: http://www.slate.com/id/2059519/

...No one knows who he was. That is the reason for the name it is the tomb of the unknown soldier. It is where unidentified remains could be remembered, if they could identify who the people were they wouldn't be in the tomb of the unknown soldier instead they would be buried with a headstone that bore their name.

Tomb Of The Unknown Soldier

3,000000

December 1963, see link http://www.arlingtoncemetery.net/jfk.htm

none

2,500 according to the Arlington official site. However some Jewish scholars claim the number is higher. There is one Jew who is not buried, but is remembered at Arlington; Ilan Ramon's body was vaporized during the destruction of Columbia, but he is remembered at the Columbia memorial in Arlington along with the rest of the shuttle crew.