I was on Drone Zone last night, It mentioned you can only request a COA for 6 months, anything over 6 months would require a waiver. I have not attempted to submit one yet until I get my daytime waiver back. They already tried to tell me I already had one. Apparently there is another company with the same name as mine on the west coast. It not me nor my company, I had to submit comments to them and its now under review. If that is the case and a COA can only be submitted for 6 month I may just do a COA and keep renewing it.
The biggest concern in my area is Military Helicopter that like to fly low. When I fly on the edge of the class D in the back yard or my field I use the beacon on the M2E, even in daylight.