The Blue Book refers to which of the following?

• A. The Regulations for the Order and Discipline of the Troops of the United States.
• B. A standard infantry drill manual published in the 20th century.
• C. A manual for religious ceremonies.
• D. A medical field manual.

Answer: (A)

The main idea tested here is recognizing a historic military reference known as the Blue Book. The Blue Book refers to the Regulations for the Order and Discipline of the Troops of the United States, the early drill and discipline manual created for the Continental Army around the Revolutionary War era. Its blue cover led to the nickname, and it provided standardized instructions on marching, formations, commands, camp routines, and how soldiers should conduct themselves in garrison and on the move. This manual helped bring unity and discipline to American troops under Washington and influenced how drill and discipline were taught thereafter. The other options describe different kinds of manuals—one a 20th-century infantry drill manual, another for religious ceremonies, and another a medical field manual—none of which match the historical usage tied to the Blue Book.