Home2013 Treaties and Agreements ...Spain (13-521.1) – Protocols Amending the Defense Cooperation Agreement of December 1, 1988 hide Spain (13-521.1) – Protocols Amending the Defense Cooperation Agreement of December 1, 1988 TIAS Office of Treaty Affairs May 21, 2013 Defense: Cooperation Protocols amending the agreement of December 1, 1988, as amended. Signed at Brussels October 10, 2012; entered into force May 21, 2013. Signed at Washington June 17, 2015; entered into force September 9, 2015. Download attachment [495 KB] Tags Defense Spain Treaties