"Combat Indicators - Part One" is the 568th episode of Casualty and the 27th episode of the 21st series.
Dixie is jealous that Cyd is spending so much time with Greg. Meanwhile, new Army consultant Lt Col Andrea Petersen arrives and quickly riles Selena by being rude to an overweight patient having a heart attack. Later, Andrea tells Dixie that she's keen to do a shift with the paramedics. Elsewhere, Nadia persuades Guppy to give a patient a suppository for her. Andrea is angry when she finds him carrying out a nurse's procedure and Kelsey is made to do it instead.