What method should all Department of Defense personnel use to pay for official travel costs?

The correct answer is the Government Travel Card. This method is used by Department of Defense personnel to streamline the process of paying for official travel costs. The Government Travel Card provides a convenient and efficient way for service members to manage expenses related to official travel, such as lodging, transportation, and meals.

Using the Government Travel Card comes with numerous benefits, including the reduction of out-of-pocket expenses for travel-related costs and the ability to separate personal and business expenditures, which simplifies reimbursement processes. Additionally, the Government Travel Card helps ensure compliance with financial regulations and guidelines set forth by the Department of Defense.

Other methods, such as personal credit cards, may lead to personal financial burden while waiting for reimbursement, and cash allowances do not provide the same level of tracking and accountability for government expenses. Bank transfers are not typically used for on-the-spot travel expenses. By utilizing the Government Travel Card, personnel adhere to standardized financial procedures designed specifically for official travel purposes.