This response is based on the information provided.  We suggest you discuss with your contracting and finance teams, program manager and/or legal department as appropriate. 

You did not ask a question so we are unclear as to specifically what you are trying to resolve.

We assume by ADA, you are referring to the Anti-deficiency Act.  If you have sufficient funding, ADA is not an issue.  As always, you need to adhere to statutory minimums and applicable thresholds.  Your team will need to determine with Reserve or Guard units as to whether they can take on the task, meet your schedule and deal with the possibility of the unit be called to action.  Your team will need manage the project and be overall manager/arbiter of disagreements if you also have a contractor doing some of the work.

Another point is that your agreement would likely need to be some sort of cost reimbursement arrangement as government units performing acquisition work operate (generally by law) under the premise they must be reimbursed 100% of their cost.  So the labor and equipment they are to use at no charge would need to be codified in an agreement as well as any incidentals, such as travel, per-diem, supplies etc. they might request reimbursement for.