 The Navy calculated a $450 million price for the arsenal ship, but Congress scrapped funding for the project in 1998.The U.S. Navy has since modified the four oldest Trident submarines to SSGN configuration, allowing them to carry up to 154 Tomahawk cruise missiles using vertical launching systems installed in the tubes which previously held strategic ballistic missiles, creating a vessel roughly equivalent to the arsenal ship concept.In 2013, Huntington Ingalls Industries revived the idea when it proposed a Flight II version of the LPD-17 hull with a variant carrying up to 288 VLS cells for the ballistic missile defense and precision strike missions.