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As you can see Suicide Squad #1 gets a shout out for the months March - December for the1987 chapter. But you can see some other milestone issues on these two pages which I actually used to have except for that Batman issue. The other Squad issue that shows up in the book is Suicide Squad #23 (1989 chapter) because it was the first time Oracle (Barbara Gordon) initiated contact with Belle Reve effectively making that issue Oracle's first appearance in the DC Universe. A Google search (images tab) with key words DC Comics Year by Year A Visual Chronicle will show you more of the book and you can also find reviews on Youtube for it as well.