This is not a treaty, it is a logistical agreement. We have a lot of these admistrative agreements with countries around the globe.
Essentially, if a US ship or aircraft is passing by or flying through India and needs a spare part, fuel, food, etc... The Indians will provide it and bill us a fair price, instead of asking for cash up front. If an Indian ship or aircraft needs something and and a US ship or base nearby has it, we’ll provide it, and bill them.