right seat, left seat
n.— «All deploying and redeploying units have an overlap time so the new unit can learn the battlespace from the previous one. The process is called “right-seat, left-seat.” New units coming into the area ride along with the unit they are relieving—sitting in the right seat to observe operations. After the familiarization, the new unit gets in the left seat and the relieving unit observes. The process takes a couple of weeks.» —“‘Artificial Spike’ Leads to Highest Troop Level in Iraq” by Jim Garamone Military Family Network Aug. 8, 2007. (source: Double-Tongued Dictionary)
Further reading
Enthusiastic book recommendations! Martha’s savoring the biography of Alexander von Humboldt, the 19th-century explorer, polymath, and naturalist who revolutionized our understanding of nature and predicted the effects of human activity on...
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...