Johnson, Benji (10 November 2020). "Ground Based Strategic Deterrent". Congressional Research Service. Archived from the original on 10 May 2021. Retrieved 10 November 2020.
Morrison, Tim (20 January 2021). "The Case for Modernization". Real Clear Defense. Archived from the original on 22 January 2021. Retrieved 10 May 2021.
Johnson, Benji (10 November 2020). "Ground Based Strategic Deterrent". Congressional Research Service. Archived from the original on 10 May 2021. Retrieved 10 November 2020.
Morrison, Tim (20 January 2021). "The Case for Modernization". Real Clear Defense. Archived from the original on 22 January 2021. Retrieved 10 May 2021.