The action Patricia should NOT take to prepare for her TDY (Temporary Duty Travel) is:

• Hold onto vouchers from earlier trips so she can process them all together when she returns.

This is not recommended because travel expenses and vouchers should be processed timely, not held over for multiple trips. Other proper actions include ensuring her travel card data is current in the DoD travel system, validating with her APC that her travel card credit limits cover expected TDY expenses, and ensuring her travel card account is open and ready for use to pay for travel expenses.