On May 17, 2005, Los Angeles voters rejected a proposal (Proposition A) that would have merged LAPD and the Los Angeles Airport Police. The argument against this proposal was that officers of the Los Angeles Airport Police had more extensive training in airport law enforcement and security operations. LAPD officers would have needed more training in this new function. At the request of Airport Police, LAPD officers are assigned on an overtime basis to security checkpoints in the terminals at LAX. This assignment became available to LAPD officers and supervisory personnel due to staff shortages at the Airport Police.