In 2018 Trump administration allotted $670.6 billion for the defense budget, the highest since Ronald Reagan (1981-1989) was the incumbent.
The U.S. National defense budget from 1981 to 2019 reveals a constant increase in defense investment year-on-year. When the military budget is mentioned, generally, it refers to discretionary budget authority. As per the Discretionary Budget Authority data, in 2018, $670.6 billion was allocated by the Department of Defense (Discretionary) (Refer Page No.8 of the National Defense Budget Estimates for FY 2020).
For the year 2019, the Defense budget was $693,058,000,000 (including Discretionary and Mandatory Budget Authority)(Refer Page No.13 Table 1-1 of the National Defense Budget Estimates for FY 2020). The budget increase in defense in 2019 in the U.S. was the largest in decades.