Letter of Offer and Acceptance (LOA)—Agreements Authorized by Section 607 of the Foreign Assistance Act of 1961. This authority allows ERDC to provide technical or research services on a reimbursable basis to friendly countries, international organizations, the American Red Cross, and other voluntary nonprofit relief agencies registered and approved by the Agency for International Development (AID). Work may not be initiated prior to receipt of funds sufficient to cover the cost of the estimate or at least an initial increment based upon an approved payment schedule that ensures funds are deposited prior to work being performed.