Which flare type uses a string for the insertion of the impulse cartridge?

The correct choice refers to the M211 flare type, which is designed with a specific mechanism for the insertion of the impulse cartridge utilizing a string. This design is integral because the use of a string facilitates a more controlled and reliable activation of the flare, ensuring proper deployment during operations.

This is particularly important in scenarios where timing and accuracy of deployment are crucial, such as search and rescue missions or in signaling situations. Understanding the mechanism behind different flare types and their operational capabilities is vital for effective use and safety in various applications.

In contrast, other flare types (like the M210, M212, and M213) may utilize different methods or mechanisms that do not involve a string for the insertion of the impulse cartridge, making the M211 distinct in its design and functional application. Thus, recognizing the specifics of the M211's construction helps identify its unique role and operational context within the broader category of flares.