My copy of that issue isn't handy but I did find the following:
Adam Strange
"Strange's first encounter with the League was with their help in defeating the alien Kanjar Ro. Ro was at war with Hyathis of Alstair, Kromm of Mosteel, and Sayvar of Llarr. (JLofA #3) Afterwards, Flash proposes to offer Adam Strange Justice League membership. Adam declined, knowing that his commitment to Rann would keep him too busy for active JLA duty. He was awarded honorary membership instead. (#4)"
Also:
Metamorpho
"Metamorpho also appeared during this time in an issue of Justice League of America, but became the second superhero to decline an invitation to join that organization (Adam Strange being the first)."
Bangzoom, I think wikipedia must be quoting some latter day retcon. I think if you check the original issues, you'll find that Adam Strange is proposed in passing conversation in JLA #4 (Green Arrow was voted in instead). Then the readers asked the editor how come the JLA even knew about Adam Strange, since he was only famous on the planet Rann. So then later Gardner Fox creates the flashback story "The Planet That Came to a Standstill" in Mystery in Space #75, which answers that question by pitting the JLA and Adam Strange against the JLA foe from JLA #3, Kanjar Ro. Supposedly MIS #75 takes place between JLA #3 and #4, explaining the discrepency. (thumbs u
Rocketeer... we need a ruling!