Final answer:
Jim has named his sister Peg as his attorney-in-fact or agent through a power of attorney, allowing her to manage his financial and personal affairs while he is on military duty.
Step-by-step explanation:
By signing a power of attorney, Jim has granted his sister, Peg, the legal authority to act on his behalf. Peg is therefore named as Jim's attorney-in-fact or agent. This position allows Peg to manage Jim's financial affairs, including paying bills, accessing bank accounts, and buying and selling stock, as well as maintaining his house, car, and boat during his absence due to military service.