Machine gunners fire at groups of five or more targets when in the:

In the context of machine gunners and their operational strategy, firing at groups of five or more targets is particularly important in the primary sector. This sector represents the area directly in front of and where the machine gun has the most effective range and potential for engagement. It is designed for high-density fire where the highest concentration of firepower can be directed effectively toward the enemy.

When engaging five or more targets, the machine gunner can maximize the weapon's lethality and suppressive effect, creating a significant impact on enemy troop movements or positions. The primary sector is specifically designed for this kind of focused engagement, making it crucial for effective combat operations.

The other sectors mentioned, such as the secondary sector, support sector, and flanking sector, are designated for different tactical purposes and engagements, emphasizing different kinds of targets and fire patterns rather than the concentrated fire on multiple, grouped targets that is executed in the primary sector.