Sorry--you cannot claim him if he turned 20 in 2019 and joined the military. He would have had more than $4200 of income for 2019 so you cannot claim him. As stated earlier--you cannot claim a dependent for only part of the year.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
