In Iran one of the armies (IRGC) controls most of the economy, including agriculture, dam building and exports, three areas which are very linked to the water mismanagement. Add the fact that their generals are getting rich through corruption you can imagine the situation is a bit different than the US army

Regardless the budget you are quoting does not include the billions that are invested yearly on Hezbollah, Hamas, PMF and Houthis which are strategically considered and used as an extension of their armed forces