21 gun salute

Tradition, and it also reduces the requirement to place and crew the guns, and the expense, to a third, of the full array of 21 barrels.
 
BarryLee said:
Nope. That's a different animal entirely.

https://en.wikipedia.org/wiki/21-gun_salute

A 21-gun salute is the most commonly recognized of the customary gun salutes that are performed by the firing of cannons or artillery as a military honor.

... As naval customs evolved, 21 guns came to be fired for heads of state, or in exceptional circumstances for head of government, with the number decreasing with the rank of the recipient of the honor.

A gun salute is not to be confused with the three-volley salute often rendered at military funerals.
 
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http://www.history.army.mil/html/faq/salute.html
This is a better explanation, thou the choice of 7 shots is still only speculation, I even herd cresty old Sailors say that it represented the 7 seas. The origins are still unknown. The beginning to the tradition is well known, it was a show of non hostile intent in the 14th century. As with many things, it evolved as a sign of respect. Now-a-days ships salute each other by dipping the ensign (flag). (the US Navy never dips first)
 
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