ace, follow the very yellow and

violent Spitfire until you reach a Japanese tunnel, eliminate the guards at the entrance and then kill the members of the tunnel that threaten our ships' guns, use grenades to open the way (grenades are very threatening in this generation, usually, if a grenade icon flashes near you, Miller or Peter will see Max), and take out the last Japanese. Once the last Japanese defender has been eliminated, Miller's mission on Peleliu Island is over for now.