The Los Angeles Airport Police was dramatically affected by several events, each resulting in organizational changes, increased responsibilities, increased training and personnel increases. These events included Proposition 13, a 1978 tax reduction measure that severely limited the ability of the Los Angeles Police Department (LAPD) to increase staffing levels at LAX; the 1981–1983 double deck road construction and terminal addition projects; the 1984 Olympics; the 1991 Gulf War; the 1992 Los Angeles Riots; and, most notably, the September 11, 2001 terrorist attacks. A substantial increases in authorized strength was connected to the 1984 Olympics. The organization more than doubled in size between 1999 and 2005, from slightly over 400 personnel to over 900.