The biggest change since Trump came into office is less restrictive ROE's. Less aircraft coming back with payloads and less restrictions on support fire for our troops. The military was worried more about being fragged under Obama than under Trump. Primarily on the area of massive restrictions due to collateral damage. Opened up more targets considered collateral damage under Obama. Trump also took a harder line on Turkey to the point of Overt threats against them regarding the Kurds. Not to mention actually taking out Syrian forces moving into the AO's of friendlies in the region. Under Obama our allies fighting with us were allowed to be slaughtered by the Turks, NOT SO MUCH ANY MORE.
To be fair, the military degraded ISIS under Obama. But not to the point under Trump which has accelerated their demise in the region. The ROE's and attack on allies in the fight being the major changes.