The Modular Scalable Vest (MSV) is a
bullet-resistant vest
A bulletproof vest, also known as a ballistic vest or bullet-resistant vest, is a type of body armor designed to absorb impact and prevent the penetration of firearm projectiles and explosion fragments to the torso. The vest can be either soft� ...
that has been introduced by the
United States Armed Forces
The United States Armed Forces are the Military, military forces of the United States. U.S. United States Code, federal law names six armed forces: the United States Army, Army, United States Marine Corps, Marine Corps, United States Navy, Na ...
in 2018.
The Modular Scalable Vest is replacing all other body armor systems in use, including the
OTV (outer tactical vest),
IOTV (improved outer tactical vest) and
SPCS (soldier plate carrier system).
The MSV is lighter when fully loaded with ballistic plates compared with its predecessor, the IOTV. The MSV fully loaded weighs .
History
The U.S. Air Force has begun to issue the MSV to replace the IOTV, with the goal of issuing it exclusively by the end of fiscal year 2022.
Design
The MSV has a four-tier configuration, allowing it to be scaled up or down depending on the threat and mission requirements
#Concealable soft body armor
#Hard armor plates and soft body armor
#Carrier with ballistic plates and soft armor
#Carrier with ballistic plates and soft armor as well as a "ballistic combat shirt" with "built in neck, shoulder and pelvic protection and a belt system to move items from the vest to the hips."

Only a few ballistic material suppliers have been able to comply with the armor panel weight specifications demanded by the US Military: Teijn Aramid, DSM Dyneema and Honeywell Spectra.
References
{{US Army uniforms
Plate carriers
Military equipment of the United States
Military equipment introduced in the 2010s