Dream of

I am a young girl in a 40's or 50's style summer dress in a backyard (very barren) there is a big house but no-one around and I'm in the middle of nowhere there is a light breeze and it's quite warm but very earie. As I am in the backyard I am sitting at a little table playing with a tea set, as I'm playing two very tall men walk around the corner (I can't see their faces they appear blacked out) and I think they are wearing some sort of uniform. I don't want to go with them and as they get close I can see a massive explosion on the horizon which turns into a mushroom cloud as it gets closer I can feel the heat and the wind and the men are happy and I wake up just before the explosion finally reaches me. I haven't had this dream in almost 2 year but before that I had it at least once a year every year from an extremely young age and I am now 21 years of age. I get the feeling it is something I have experienced before as it is so realistic and more like a memory then a dream.