Hi,
Thank you for the additional designs but I must say that I still like your # 44 best where "ISS" is becoming the logo and the mind fills in the "S" that's not there. Engineers love this kind of stuff and this is what they keep in mind, most likely unconscious but that's the trick of a good logo!
The additional designs (
#80 through
#91) distract a bit from simple basic design and become a bit fuzzy.
Regards,
B.