Another thing guys were discussing and had multiple opinions on last week:
If you use your APD to drop a trip, can you fly-- WS/GS/Swap-- on any of those days?

--YES, but you can't do ANY flying on days that have "APD" on your schedule. However, you don't have to "APD" every day of a rotation to drop it!

I just tested this, and it's true. Say you have a 5 day trip on 1st thru 5th, and you use APD to drop days 3/4/5 of the trip. The entire trip is dropped, and "APD" shows up on your schedule on days 3/4/5. You CAN Ws a trip and pick up something that flies into days 1/2. Even though you did APD drop the trip, you only asked for APD on SOME of it's days.

Wise tactical use of your yearly APD depends on whether you absolutely dont want to fly (reserve duty say and you want to ensure off), or if you just don't want to fly THAT trip and you can't drop it due to coverage.