Akira Isaki, also known as Switchblade, is a member of the Japanese Blood Brotherhood, working in the U.S. Marines.
Akira Isaki was born in the United States, and his parents were killed in a car crash when he was young, leaving him to be raised by his grandparents. However his grandparents, who had been imprisoned in a torture camp during World War II and felt bitter about Japan's ensuing humilation, taught Akira to be hateful towards the rest of the world, setting himself a duty to restore Japan's honour.
In order to do his part, Akira joined the United Staes Marine Corps, gaining the call-sign Switchblade. He eventually requested a transfer to the Commander-in-Chief's In Extremis Force (CIEF), who were heading up the Machine research.
As they fell, Switchblade gloated that despite his failiure they would die together, however Jack wasn't finished, and took Switchblade's Maghook and fired it into the abyss wall, stopping his fall. Switchblade was horrified that he had been completely beaten and that he had died for nothing, and continued falling to his death.