The purpose of this study is to find out if an advance balance perturbation training program can enhance the rehabilitation process by increasing weight-bearing strategies on the prosthetic or injured limb, and, help reduce stumbles and falls.

Inclusion Criteria:

• Research participants will be eligible active duty service members and retired veterans.
• Having lower limb trauma (transtibial and transfemoral amputations, bilateral amputations, and limb salvage).
• Are enrolled in conventional rehabilitation at the participating military treatment centers.
• Subjects with dysvascular disease will be excluded because compromised lower limb somatosensation and circulation are independently linked with poor postural stability and a history of frequent falls.
• For subjects with amputations, the individual must be a community ambulator (i.e., K-Level 3 or 4).
• For subjects with limb salvage, they will need to have an IDEO and be entered into the Return-to-Run training program.

Exclusion Criteria:

- Subjects must not have excessive pain or other neuromuscular problems that preclude them from performing the test protocol.