In his campaign, Trump called for 90,000 more Army soldiers, a 350-ship Navy, 100 more fighters, and strengthened nuclear and missile defenses. That sounds like detail, but it leaves out quite a bit.
The best pre-election analysis of the expected Trump budget came from William Hartung, a veteran and insightful analyst, who is at the Center for International Policy, drawing on Ross Harrison of the Center for Strategic and International Studies:
What we do know is that Trump has been drawing many of his defense proposals from the National Defense Panel and the Heritage Foundation. Both of these organizations have advocated for returning the defense budget to the levels proposed in the FY 2012 budget request (the so-called Gates budget). Without any other details from the Trump campaign, I think this is a good ballpark estimate for what Trump is aiming for in terms of the defense budget. The FY 2012 request is about $800-900B higher over ten years than the most recent president’s budget request.”
The call for a 350-ship Navy gives a concrete clue. Cost figures on such a naval buildup are elusive. However, the Congressional Research Service (CRS) has compiled studies of the different kinds of ships in a 350-ship navy. They don’t come cheap.