He urges Muslims in America to carry out attacks against US and Western targets.
Major Hasan has been charged with the murder of 13 people after a shooting spree at the Fort Hood base in Texas.
He has been described as a devout Muslim whose commitment to the army may have been broken by his opposition to the wars in Iraq and Afghanistan.
There is a $1 million reward for information leading to the arrest or conviction of Adam Gadahn, who is also known as Azzam al-Amriki.
He appeared in the video posted on a radical Islamic website wearing white robes and a white turban.
Gadahn was charged wtih treason in 2006 after converting to Islam and joining al Qaeda.
Adam Gadahn
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