Ohhhhh. How nice. I truly do love old motorcycles. Those are all at least WWII vintage because the suspension changed just shortly after the war. I'm pretty sure one of the OD green (olive drab green-official color of the US Army) ones is an Indian, not a HD.
My friend @princessmewmew had a great answer when asked the 'right' time to post.
Just immediately after the Unicorns poop.