Final answer:
A clenched fist when emplacing aiming posts is a signal used by military personnel to indicate stability and correct positioning.
Step-by-step explanation:
The clenching of a fist when emplacing the aiming posts is a signal used by military personnel.
In this context, a clenched fist typically means that the post is stable and in the correct position. It serves as a visual cue to indicate that the post is ready for use.
For example, in a military exercise, when soldiers are setting up aiming posts to assist in directing fire, a clenched fist could indicate to the rest of the team that the post is securely placed and aligned accurately.
Overall, the gesture of a clenched fist is a non-verbal communication method used in the military to convey specific messages and instructions. It is important for soldiers to understand and interpret these signals correctly for effective communication and coordination.