W87

W87
The Mk21 Re-entry Vehicles shown here for the LGM-118A Peacekeeper contain W87 warheads.
Type	Thermonuclear warhead
Service history
In service	1986–present
Used by	United States
Production history
Designer	Lawrence Livermore National Laboratory
Designed	Mod 0: February 1982 Mod 1: November 1986 to July 1988, March 2019 to 2030
Produced	Mod 0: July 1986 to December 1988 Mod 1: 2030 onwards
No. built	525
Variants	2
Specifications
Mass	400 to 600 pounds (180 to 270 kg)
Detonation mechanism	Contact, airburst
Blast yield	300 kt (W87-0) 475 kt (W87-1)

The W87 is an American thermonuclear missile warhead formerly deployed on the LGM-118A Peacekeeper ("MX") ICBM. 50 MX missiles were built, each carrying up to 10 W87 warheads in multiple independently targetable reentry vehicles (MIRV), and were deployed from 1986 to 2005. Starting in 2007, 250 of the W87 warheads from retired Peacekeeper missiles were retrofitted onto much older Minuteman III missiles, with one warhead per missile.^[1]