"does this mean the Bundeswehr will have to work weekends now???"
More likely it means they'll move some job training and remedial education programs from one column in the ledger to another, put some Bundeswehr officer with political connections in charge of the same people and same programs, then say, "look at what a huge increase in spending there's been".
In the mean time, they'll continue spending the funds that went to those programs on other things since they've found an excuse to increase spending and blaming that increase on the needs of the Bundeswehr.
JMHo