You’ll have to think a bit to be able to answer this question. 
#ArianeFacts #Ariane5pic.twitter.com/HHe8AIkwi3
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LEO- ATV, Earth Observation (like the Sentinels) HEO- I will say exploration missions, like Rosseta GSO-Telecommunications and meteorology MEO-Navigation, like GALILEO
Well for Rosetta and other deep space missions, we talk about escape velocity, it's not really a geocentric orbit any more.
The most interesting MEO is probably for the navigation satellites (Galileo, GPS, etc.) around 23 000 km...pic.twitter.com/bKRU2RimVC
This is such a cool gif Stéphane. 
LEO : observation satellites and low orbit telecom satellites like @OneWebSatellit1 or #O3b
MEO: navigation satellites like @GalileoGNSS
GEO: telecom satellites like #Konnect tomorrow evening
HEO: ? I don't know for #ariane5 
How about ATV missions to the ISS? 
LEO: earth observation, communication, ISS cargo MEO: Galileo GEO: communication, weather HEO: space telescopes
You're good Arco. You're GOOD. 


Geo statonary orbit!
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