Athena Parker plays with her cat, Poseidon, in the living room of her family's home aboard Marine Corps Base Hawaii, Sept. 12, 2013. Since birth, Parker has undergone three open-heart surgeries and five heart catheters to treat her hypoplastic left heart syndrome. (U.S. Marine Corps photo by Cpl. Matthew Callahan) - Athena Parker plays with her cat, Poseidon, in the living room of her family's home aboard Marine Corps Base Hawaii, Sept. 12, 2013. Since birth, Parker has undergone three open-heart surgeries and five heart catheters to treat her hypoplastic left heart syndrome. (U.S. Marine Corps photo by Cpl. Matthew Callahan)