Before or during an engagement special signals may be agreed upon to facilitate the solution of such special difficulties as the particular situation is likely to develop, but it must be remembered that simplicity and certainty are indispensable qualities of a signal.
Orders.
[36.] In these regulations an order embraces instructions or directions given orally or in writing in terms suited to the particular occasion and not prescribed herein.
Orders are employed only when the commands prescribed herein do not sufficiently indicate the will of the commander.
Orders are more fully described in paragraphs [378] to 383, inclusive.
Commands.
[37.] In these regulations a command is the will of the commander expressed in the phraseology prescribed herein.
[38.] There are two kinds of commands:
The preparatory command, such as forward, indicates the movement that is to be executed.
The command of execution, such as MARCH, HALT, or ARMS, causes the execution.