It is because at arsenal the army arsenal was there.
Arsenal of Democracy was created in 1940.
Allegheny Arsenal was created in 1814.
Rome Arsenal was created in 1813.
Frankford Arsenal was created in 1816.
Hanyang Arsenal was created in 1891.
Arsenal AD was created in 1878.
Arsenal TV was created in 2007.
Kremlin Arsenal was created in 1828.
Augusta Arsenal was created in 1816.
Charleston Arsenal was created in 1841.
Anaheim Arsenal was created in 2006.
Berekum Arsenal was created in 1978.