HARTFORD, Conn. - Lockheed Martin will acquire Black Hawk helicopter maker Sikorsky Aircraft for $9 billion as it seeks greater access to the military and commercial helicopter market.<p class="ap-story-p">United Technologies Corp. said in June it planned to shed Sikorsky so that the aerospace and building systems conglomerate could better focus on high-technology systems for both of those industries.<p class="ap-story-p">Lockheed will add the world's largest builder of military helicopters to its arsenal.<p class="ap-story-p">"One of the key elements of our strategic planning is to secure and extend our core defense business and we feel confident that the addition of Sikorksy will contribute significantly to the growth objective," Lockheed Martin CEO Marillyn Hewson said during a conference call.<p class="ap-story-p">Sikorsky also makes presidential helicopters and its aircraft have returned astronauts home after they splashed down in the Pacific Ocean at the end of their space travels.<p class="ap-story-p">Lockheed Martin plans to add Sikorsky to its mission systems and training unit.