What form is typically used when issuing a Purchase Order for a simplified acquisition estimated at $19,575?

The correct form for issuing a Purchase Order for a simplified acquisition estimated at $19,575 is the DD Form 1155. This form is specifically designed for the government to procure supplies or services through a simplified acquisition process, which can streamline the purchasing procedures for contracts valued below the simplified acquisition threshold.

The DD Form 1155 is useful because it consolidates the purchase order requirements into a single document, simplifying the process for both the contracting officer and the vendor. This form captures essential information such as the description of items or services, quantities, delivery dates, and terms and conditions, making it a practical choice for small acquisitions.

In the context of the other forms mentioned, DD Form 254 is used to provide security classification guidance, the DD Form 1391 is a Military Construction Project Data form primarily for construction projects, and SF 1449 is a standard form for commercial sales but not specifically tailored for simplified acquisition procedures under certain thresholds. Thus, the DD Form 1155 stands out as the appropriate choice for simplified acquisitions like the one described.