percent stake or more would not have the right to buy additional shares. In August 2012, Navistar announced it would use Cummins engines and SCR technology. After 37 years with the company, Dan Ustian retired immediately in August 2012 and left his position on the board as well. Former Textron CEO Lewis Campbell was named interim CEO and Troy Clarke was promoted to chief operating officer. Ustian's severance package began at $7.9 million. The company's proxy statement during this time estimated the total package to be $14.6 million, contingent on a share price of $42.07 on Oct. 31, 2011, the end of the company's fiscal year. On September 9, 2012, billionaire and key stock holder Carl Icahn sent an open letter to Navistar's board, blasting them for "abysmal business decisions" and "poor corporate governance." Icahn noted from 2009 to 2012, that "this Board has authorized spending shareholder money on lawsuits against suppliers, competitors and regulators, marketing plans to convince customers that non-compliant engines are actually compliant, accumulating non-core assets such as a Recreational Vehicle manufacturer, and a "gold-plated" corporate headquarters that cost over $100 million. The one thing this Board refused to spend money on was a back-up plan involving the industry standard technology Navistar now must rely on." In a September 2012 interview, Cummins CEO Tom Linebarger said, "all we did was act nice to them (Navistar) even when they didn't talk nicely about us," he smiled, recalling harsh comments that Navistar executives had made about SCR being used by all its competitors. In October 2012, Chief Product Officer Deepak Kapur stepped down, followed by Group Vice President of Product Development Ramin Younessi in December 2012. CIO Don Sharp also left the company in April 2013. Layoffs and consolidation August 2012 featured a Voluntary Separation Program (VSP) as well as involuntary layoffs. This was due to the failed engine strategy, rising warranty costs and declines in commercial and military sales. The company let go 500 employees and in September 2012, announced plans to lay off 200 more salaried employees. In addition, the company announced it would close its Garland, Texas manufacturing facility by mid-2013, resulting in the loss of 900 jobs. In March 2013, Navistar announced that interim CEO Lewis Campbell would step down and COO Troy Clarke would be named CEO and chairman of the board. Jack Allen was named COO. In June 2013, CFO A.J. Cederoth stepped