Of all your designs, I like #24 the best. I like the that you are thinking of telecommunications for the symbols, particularly in #23 and in #24. The symbol in #23 was a bit too modern for me. I preferred #24 because it conveys 'global communication'. I also liked that you were trying something else with the acronym in the circle on #22.
Since Hytsio Aboa is hard to say, I like seeing the acronym HAL. People can choose to say that instead.