ASTRO America to manage US Army Jointless Hull project 7 April 2021 (Last Updated April 7th, 2021 11:59) ASTRO America has been selected by the US Army to manage a new effort called the Jointless Hull project. Share Article Hulls are a key part of Humvee vehicle construction. Credit: PRNewsfoto/ ASTRO-America. ASTRO America has been selected by the US Army to manage a new effort called the Jointless Hull project. The initiative will explore the use of metal additive manufacturing (AM) technology to develop a ‘hull-scale tool’ for the US Army. The Jointless Hull project seeks to deliver enhanced production speeds, minimised production costs, lower vehicle weight and improved survivability.