say that that this money must be spent, nor does it mention any obligation of the department to do anything specifically, nor does it mention any obligation to spend it.
Congress "delivers" money to the department - thanks. The head of the dept will decide how best to use it.
Congress "provides" money to the department- ok, we don't need it all. Congress may choose to provide less next time.
Congress "invests" money in the causes of the dept - if they think it is not a good investment, they can choose to allocate less if they deem it proper. The very definition of the word investment implies an uncertain outcome.
I'm surprised that a lawyer is having such a hard time with this.
Seems like they did a bad job of writing this up if they wanted specific obligations honored.