Number 1 has its particular military form which must be precisely followed. It consists of

{ The Brief
{ The Body
{ The Ending
{ Indorsements
{ Enclosures

The Brief consists of the following in the order
{ The Heading
{ From Whom Sent
given { To Whom Sent
{ The Subject

An example of a Brief would be:

Hq. Eastern Department,
Governors Island, N. Y., May 21, 1940.

From: The Adjutant.
To: Captain James L. Douglas, 99th Inf.
(Through C. O. Madison Barracks, N. Y.)
Subject: Delay in submitting report.

Another example would be:

Company A, 99th Infantry,
Madison Barracks, N. Y., Jan. 9, 1940.

From: Commanding Officer, Co. A, 99th Inf.
To: The Commanding Officer.
Subject: Insufficiency of shoes.