Final answer:
On a DD 175 military flight plan, "SVFR" should be specified in the "TYPE FLT PLAN" block when a pilot intends to depart under Special Visual Flight Rules, which allows for flight in controlled airspace with weather conditions below standard VFR minima.
Step-by-step explanation:
When planning to depart Special Visual Flight Rules (SVFR), in the "TYPE FLT PLAN" block on a DD 175 military flight plan, you would specify "SVFR" as the type of flight plan you are filing. The DD Form 175, also known as the Military Flight Plan form, is used to provide air traffic control facilities with information necessary to ensure flight safety.
The type of flight plan noted on the form is essential for controllers to understand the pilot's intentions and the rules that the flight will be conducted under. In the case of SVFR, it indicates to air traffic control (ATC) that the pilot is requesting special clearance to operate under visual flight rules in controlled airspace where the weather conditions are below Visual Flight Rules (VFR) minima but are still sufficient for the pilot to maintain visual reference to the terrain.
When planning to depart Special Visual Flight Rules (SVFR), the "TYPE FLT PLAN" block on a DD 175 form should indicate the type of flight plan being filed. In this case, it should be indicated as SVFR. SVFR is a type of flight plan that allows pilots to operate in weather conditions below basic visual flight rules (VFR) but better than instrument flight rules (IFR). It is typically used when a pilot needs to depart an airport under SVFR conditions.