These debentures are backed by integrity and creditworthiness. They do not have any specific collateral backing. Therefore, the ability of the issuing GSE to generate sufficient cash flows to satisfy the obligation would decide the ability of the issuer to repay the debt. It is assumed that the GSE Agency debentures carry an implicit guarantee from the US government. The reason is the capacity of GSE's direct borrowing from the US treasury and the significance of the GSE's congressional charters and missions.