Which of the following marksmanship tasks does not require live fire?

The correct answer is that the operating check does not require live fire. An operating check typically involves verifying that weapon systems and equipment are functioning properly and safely. This process can be carried out using dry-fire drills or simulations that do not involve any live ammunition. Such checks focus on the operation of the weapon, ensuring it is clean, properly assembled, and ready for use, without the necessity of firing actual rounds.

In contrast, sustainment training, field training, and remedial training involve the use of live fire to some extent. Sustainment training aims to maintain marksmanship skills, which generally requires live practice to ensure proficiency with real ammunition. Field training often involves realistic scenarios that simulate combat conditions and likewise require live fire for effective learning and assessment. Remedial training is specifically designed to address deficiencies in marksmanship skills, and it typically necessitates live fire to correct any issues and reinforce proper shooting techniques.