Methods and devices to reduce the likelihood of injury from concussive or blast forces

A system comprising:

• a first device;
• a second device;
• wherein each device has an appropriate size and shape to restrict blood flow egressing from the head of a subject when the devices are placed against the neck of the subject;
• and
• a garment having:
• a shoulder region structured to be shoulder worn by the subject,
• an opening at a laryngeal prominence of the subject when worn by the subject, and
• a collar region made of an elastic material,
• wherein the collar region is configured to receive the first and second devices so that, when the garment is worn by the subject, the first and second devices are positioned over a respective one of a pair of neck veins of the subject, and
• wherein the elastic material is configured to exert sufficient pressure on the first and second devices so that, in combination, the first device, the second device, and the elastic material apply a compressive pressure to the pair of neck veins to restrict blood flow egressing from the head of the subject while the garment is worn by the subject.