Answer by Kris Rosvold:
It doesn't say that word for word.
What it does say, after all the explanatory language is:
"The Right of the People to keep and bear arms shall not be infringed."
However, the militia has LONG been defined as "every able male between the ages of 17 and 45" because these are the folks who were to be called to Service in the event of a war, or any other need for troops.
What you have to remember is that when the Constitution was drafted there was to be only one "standing force" which was the Navy.
The Army was designed to be essentially disbanded in peace time, and was intended as a strictly temporary force so far as the rank and file was concerned. Many of the officers even went home.
suggestion: Look up the term militia at Blacks dictionary of Law or another legal (vs. common usage) dictionary.