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The National Fire Protection Association (NFPA) standard that covers Structural Personal Protective Equipment (PPE) is indeed NFPA 1971. This standard outlines the performance requirements and specifications for protective clothing and equipment worn by firefighters during structural firefighting operations. It includes regulations on flammability, thermal protection, and durability, ensuring that the gear can withstand the harsh conditions encountered during a fire.

Understanding the importance of NFPA 1971 is critical for ensuring the safety of firefighters, as it establishes the benchmarks for what constitutes effective protective gear. This standard ensures that the PPE not only protects against heat and flames but also against various hazards such as chemicals and cuts that may be present in firefighting environments. In contrast, the other options either pertain to different types of PPE or focus on various aspects of firefighter safety and equipment, but are not specifically dedicated to structural firefighting gear. For example, NFPA 1983 relates to life safety ropes and harnesses, while NFPA 1977 addresses protective clothing for wildland firefighting.