Contractors must get badging and travel to obtain - pay labor hours during travel

Similar question has been asked about paying for travel time. In this situation the employees are nurses & doctors that must get badging and due to location / regions they must travel to get to a badging location. Granted the contract doesn't specifically state we will pay for travel time but it is a requirement. Some distance can take a full day and some rates are high. Originally was of the opinion to not pay but it is a requirement, they need for working. I didn't see anything in the FAR from not allowing and the COR just inquired the contract is in year 4 - all travel costs are being reimbursed by the contract.