WASHINGTON, Jan. 12 -- Law firms assisted companies in the following recently announced transactions: * * * Kirkland & Ellis... ...advised Stellant Systems and its sponsor Arlington Capital Partners on the proposed $960 million sale to TransDigm Group, supporting a strategic exit and transfer of a specialized defense and aerospace manufacturing platform. The advice covered corporate, tax, regulatory, IP, employment, environmental, and antitrust matters. The Kirkland team included Douglas Ryde more ST