When it comes to infantry spacing, i.e. the appropriate distance between one individual and another, the specific distance should be dependent on terrain and circumstance, usually called out by the lead element e.g. the fireteam leader. For infantry, in thick, low visibility terrain or atmosphere, such as jungle or night-time forest, spacing should be as close as 3-5m, whereas in high visibility open terrain, such as desert or open fields in broad daylight, spacing can and should be up to 25m between each individual. The likelihood of mines/IEDs, or Indirect Fire (IDF) should also factor into the chosen spacing with higher risk, increasing the recommended spacing size.
Spacing is the distance that should be held in standard situations both when on the move and holding position, though it is allowable for individuals to move closer for specific reasons such as: buddy team medical assistance, ammo distribution, spotting etc, but individuals should always move back to an effective spacing as soon as these are completed.