operating expenses, international and entitlement travel vouchers, and USDH benefit and allowance payments Purchase Order, Blanket Purchase Agreement, Grant, travel authorization or agency specific authorization of preparing and reviewing invoices, vouchers, travel advance requests, and advance liquidations in US payment in-progress, disputed or certified paid. Travel Advance Requests: Assesses and evaluates advance grantees, contractors, employees, and general vendors. Travel/E2: This requires a complete and in-depth knowledge