The Commission is authorized and directed, to the extent it deems necessary to effectuate the provisions of this chapter—
Any purchase made under this section may be made without regard to the provisions of section
5 of title
41, upon certification by the Commission that such action is necessary in the interest of the common defense and security, or upon a showing by the Commission that advertising is not reasonably practicable. Partial and advanced payments may be made under contracts for such purposes. The Commission may establish guaranteed prices for all source material delivered to it within a specified time. Just compensation shall be made for any right, property, or interest in property taken, requisitioned, condemned, or otherwise acquired under this section.