 Complete the following phrase:  In 1971, he was promoted to the rank of Lieutet Colonel in the Ceylon Army Volunteer Force and was appointed commanding officer of the Field Security Detachment, which was tasked with internal security. Prime Minister Sirima Bandaranaike was worried of a possible threat to the government from army officers loyal to the opposition political parties with her prior experience in the 1962 attempted coup détat. Captain Denzil Kobbekaduwa, under Ratwattes command reported a potential threat to the government by the Janatha Vimukthi Peramuna JVP which was preparing for an armed revolt. On 5 April 1971, the JVP attacked several police stations in a premature start to 