Seen here in a close-up from the last photograph, Dr. John Ronaldson Russell took the position of Chief Medical Officer and Lucy M. Watney was appointed Commandant as Blanche Warde, initially appointed Commandant, had to stand down due to other commitments.
Reference: WH1029
Of the three nurses standing together, the one in the centre is Blanche Theresa Warde.
Reference: WH1030