Flag effect

I have a waving American flag on my army and navy airfields along with sound effects of bugle calls. I would like to be able to have that flag raised and lowered. Is this possible and how? Also if it IS possible, I know from working with special effects a couple years ago that they can happen at specific times. Therefore can this animated flag be triggered at a specific time? Waiting patiently for an answer. Thank you for taking the time to reply.