Three San Diego Coast Guard boat crew members will face the military version of a preliminary hearing beginning Tuesday for the Dec. 20 crash that killed an 8-year-old Rancho Peñasquitos boy. The top charge, involuntary manslaughter, is against Ramos. Howell and Rasmussen are charged with negligent homicide. Coast Guard officials have said it may be the first time in modern memory that any member of the Coast Guard has been charged with manslaughter for actions taken in the course of duty. A fourth boat crewman, Petty Officer 3rd Class Lavelle M. Teague, faces lesser charges. The Coast Guard announced Friday that Teague’s case is being handled separately.