Midcourse Phase : The phase of a ballistic missile trajectory in which the RVs travel through space on a ballistic course towards their targets. This phase lasts up to 20 minutes
Federation of American Scientists, Glossary of Acronyms and Terms, Washington, DC,USA 2004. https://fas.org/pubs/_docs/10072004163905.pdf, (DPrep - Amer) {1003}