previous novel. Ryan Sr. has been sworn in as president of the United States after having been elected the previous year. Command Authority - 2010, explicitly states that Ryan Sr. is in the second year of his second presidential term. It is implied the novel takes place about five months after the events of Threat Vector in the springtime. Based on the timelines of previous books, the 'Thirty years earlier' chapters must still take place in 1983 (and are therefore actually 27 years earlier). Support and Defend - 2010. The Campus is on operational stand down following the events of Command Authority. Dom Caruso is stated as being 32 years old. Brian's death is mentioned as taking place over two years earlier. Ethan Ross had worked at the White House for three years under two administrations. Full Force and Effect - 2010, based on the ages of John Clark (66) and Ding Chavez (47). It is implied that the Vietnam operation takes place several months after the events of Command Authority and approximately one week after the end of Support and Defend. It is mentioned that Clark's torture in Locked On took place two years ago. Choi tells Ri, and it is also mentioned in a conversation between Ryan Sr. and Arnie Van Damm, that Ryan has two years of his presidential term left. Under Fire - 2010. The novel is written as though it takes place in late winter: it was sleeting in Washington and fake snow spray was used in Edinburgh. It is stated that the Forth Road Bridge tolls were reintroduced in February and that the seaside tourist season is three months away. However, the timelines of the next two novels set this sometime in late summer or early autumn. Commander in Chief - October 2010. It is explicitly stated that the novel takes place in October and the events of Full Force and Effect are implied throughout the book as taking place several months ago. This is contradicted by mentioning that the events of Command Authority took place 'a year earlier', Jack Ryan Jr. had worked for The Campus for five years, and John Clark's age is 67. It is also noted that Jack Ryan Jr. had known Ysabel for one month. The continued mention of October and the approaching winter verifies Under Fire and this novel are set at the end of 2010 - Duty