What should a sector of fire ensure for effective defense?

The focus of a sector of fire in a defensive operation is to ensure mutual support and complete coverage of a designated area. This concept is essential for effective defense because it allows for overlapping fields of fire among different units or weapons within the team.

When mutual support is established, one unit can provide covering fire for another unit that may be engaged with the enemy or repositioning. This coordination maximizes the firepower available and ensures that gaps in coverage do not exist, which could be exploited by the enemy. Complete coverage further implies that every potential avenue of approach is monitored and defended, minimizing the risks of surprise attacks or breakthroughs.

While the other options touch on important aspects of defense, they do not encapsulate the comprehensive strategy that mutual support and complete coverage provide. For instance, redundant weapon systems might enhance firepower but do not inherently guarantee effective coverage of the area. Coverage of more than one area could lead to a diluted focus, reducing the effectiveness of the defense. Concentration of fire exclusively could leave other sectors vulnerable and potentially create blind spots essential for a successful defense. Thus, mutual support and complete coverage remain foundational for a robust defense strategy.