USAA named Stuart Parker its new chief financial officer Tuesday, filling the post vacated Monday by Kristi A. Matus.<br /><br />Parker has been with San Antonio-based USAA since 1998 and has served as chief administrative officer since last month. Before that, he was president of USAA Property and Casualty Insurance Group for five years.<br /><br />Matus is leaving USAA next month to become head of Aetna Government Services, a newly formed group comprised of Aetna's Medicare, Medicaid, public and labor, and federal employee health benefit plan businesses.<br /><br />Matus will serve as special assistant to USAA CEO Joe Robles until her departure March 2.<br />