Fourteen of these 16 new generation DP-2 OSVs have already been added to the company's Upstream fleet on various dates since May 2008, including the HOS Sweet Water, the sixth and final 240 ED class OSV delivered under this program, which was placed in service in the GoM spot market in December 2009; and the HOS Arrowhead, the sixth 250 EDF class OSV delivered under this program, which commenced operations in January 2010 under a multi-year charter performing military support services. The HOS Pinnacle, the seventh 250 EDF class OSV delivered under this program was placed in service during February 2010. The remaining two OSVs under this newbuild program are expected to be placed in service in May and August 2010, respectively. Inclusive of the vessel deliveries referred to above, the aggregate cost of this program is expected to be approximately $445.0 million.