All military gains and prospective gains will be either diminished or eliminated by House Democrats.
They would still need approval from the senate and the president
There would be nothing for the Senate to approve and for the President to sign if a proposal was voted down in the House.
The Idea is that the Dems can propose a smaller amount directed at specific items and omit others they disapprove. The Senate cannot add items or amounts that the House would not approve of else no defense appropriations or only sustained at current level (unlikely). Items which need specific line funding like a new weapons program or the Space Force are dead. Riders are going to be common - these will be either trade offs for more domestic spending or military specific social programs (most likely).