<prompt> Gadzira shanduro yakaoma kunzwisisa yemutsara uyu MARSEC inomiririra matatu-tiered United States Coast Guard Maritime Security system.  <response>: Chokwadika, shanduro yakaoma kunzwisisa zvikuru yemutsara wacho ndeiyi MARSEC inomirira gadziriro yeUnited States Coast Guard Maritime Security ine nhano nhatu yakasikwa kuti iwirirane ne, uye kupindura nenzira yakabatana kuDhipatimendi reHomeland Securitys Homeland Security Advisory System HSAS . 