"The Spirit of America" in Melania's tweet

Spirit of America is a "charity"

https://en.m.wikipedia.org/wiki/Spirit_of_America_(charity)

Working with the US Embassy in Kyiv Ukraine, in 2016 Spirit of America funded the establishment and optimization of ArmyFM, a Ukrainian Ministry of Defense radio station that provides information and entertainment to soldiers defending their country in eastern Ukraine, who are suffering from a barrage of Russian propaganda.[2]