U.S. Army Corps of Engineers' Park Ranger Samantha Vazquez explains to Earth Day volunteers the process of placing name placards on tree trunks in Fort DeRussy Park area near the Corps' Pacific Regional Visitor Center. More than 50 volunteers from the U.S. Army Corps of Engineers partnered with local JROTC students and others to clean up Waikiki Beach April 2 as part of Earth Month 2016.