 The battle color incorporates both the anchor and the sun with eight rays from the seal, but also includes the three stars of the national flag symbolizing the Philippines's three major island groups above the anchor.The color is similar to the one used by the USMC during the First World War.The Sierra Madre BRP is a Philippine Navy vessel that was stranded voluntarily off the island of Ayungin, in the heart of the South China Sea, in 1999.