Why are machine guns placed just behind the front line and why are they so close to the bunkers?

Machine guns are placed just behind the front line to provide overlapping fields of fire and to effectively suppress enemy advances while minimizing exposure to direct fire. Their proximity to bunkers enhances their defensive capabilities, allowing for quick repositioning and support for infantry in fortified positions. This placement helps create a strong defensive perimeter, maximizing the effectiveness of the machine guns in protecting the troops and the overall defense strategy.