no offence but this is very old, i found it by accident like a year ago and i assume it will have been found before then but i never see many people using it, either because its not very good , or because not many people know about it, but it is a nice tutorial on how to do it for those who cannot
i think you can get on it in 2 ways one jump from anywhere on the top to it and the 2nd is edging off the misile
you can also edge around the missie but tht is tricky