sentences:  He resigned from the Army in 1905 with the rank of Captain, and became New York's First Deputy Commissioner of Police in January 1906, at the age of 28.Waldo, who had served as New York City Fire Commissioner since the beginning of Mayor Gaynor's term in January 1910, was in office at the time of the Triangle Shirtwaist Factory fire which occurred on March 25, 1911 and killed 146 people.On June 9, 1911, only 17 days after taking office as Police Commissioner, Waldo founded the motor-cycle squad, organized under the Office of Street Traffic Regulation Bureau.