An unsubsidized Stafford loan is a loan through the Federal Direct Loan Program that will accrue interest from the point of disbursement. In other words, interest will start to occur on your Stafford loans while you are attending Western Seminary.
Also note there is a 1.069% origination/guarantee fee on any unsubsidized Stafford loans, meaning an unsubsidized Stafford loan in the amount of $6000 will result in a disbursement amount of $5937.