WASHINGTON (AFP) The top US military official in charge of training Afghan troops says he will ask allied leaders Monday for 1,000 additional specialised trainers in a bid to bolster security forces. Lieutenant General William Caldwell said the trainers were key to speeding up the buildup of Afghan police and army from December to May 2011 before a transfer of control to the Afghan govt in July, when US forces are due to begin withdrawing from the country. If we do not get the trainers we need, transition will be delayed, Caldwell told The Wall Street Journal. He said Afghanistan needed 133,000 more military personnel and police officers to ensure the handover of security responsibility would take place smoothly, pointing to a high attrition rate in Afghanistans security forces as the greatest challenge to the training mission.