Which goal stated in the preamble to the u. s. constitution requires a strong army

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, [note 1] promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the Unitedstates ...

1. the spread of reform movements aimed at perfecting american society