Normal interval Procedures
To obtain Normal Interval from Close Interval, the command is Normal Interval, MARCH. On the command of execution MARCH, the right flank man stands fast. All men to the left of number one man execute Left Step March, take one step less than their number (for example, number three man takes two steps), and Halt.
The Number of steps you took to obtain close interval is the number of steps you take to obtain normal interval.
Video:
http://www.pdf-archive.com/2014/01/22/army-tc-3-21-5/army-tc-3-21-5.pdf
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