Supporting troops

[Valorgamer]

Do troops supporting another city keep their 'home' city's research or do they take on their host's ? If I send level 2 guardians in support of a city that has level 3 guardian research do they become level 3 while they are there and revert back when they come home, but if the supported city is only 1 they drop down to 1 ? What happens if no research has been made at the host city ?

[Akilies]

The troops keep the research of the home city, so whatever you send is what the supporting city is going to get