What is required to be included in a proposal strip regarding the proposed departure time?

The inclusion of the exact departure time along with the departure arrow in a proposal strip is essential because it provides clear and precise information for air traffic control. The departure arrow visually indicates the scheduled time for take-off, which is vital for ensuring that all relevant parties are synchronized, from the flight crew to the controllers managing the airspace. This detail helps to facilitate effective coordination, scheduling, and the overall safety of airport operations. Providing just the military time format lacks important context, while omitting details related to the flight crew or destination airport would not meet the comprehensive requirements for proper communication in air traffic management.