The key point from a benefit standpoint between a "W" grade and a failing one is when the class is considered to have ended. When you choose to drop a class and receive a "W" grade, your training time credit for that class ends on the date of the drop. If you continue in the class and end up with a failing grade, your training time credit for that class continues until the scheduled end date of that class. Dropping training time credits can impact your GI Bill benefits, especially for Post-9/11 veterans.
Let's consider two students, Juan and Julie. Both are Post-9/11 veterans who have nine credit hours of training time and both are doing very poorly in a three-unit history class this term. Juan decides to drop the class after the drop period but two months before the end of the term, Julie stays in class and ends up with an "F" grade. How did their decisions affect them?