: Training Circular 3-20.31, "Aviation Unit Training and Qualification - Crew"
: Gunnery Skills Test (GST). Teaches fundamentals such as maintenance and malfunction correction. tc 3-20.31 training and qualification crew pdf
You can find the TC 3-20.31 document in PDF format through various sources: : Training Circular 3-20
The best and most official way to access TC 3-20.31 is through the United States Army's official publications portal or military databases. Here are some steps to find and access the PDF: : Training Circular 3-20.31