Incentives for our Nation's Veterans in Energy Sustainability Technologies or the INVEST Act - Amends the Internal Revenue Code to allow the work opportunity tax credit for the hiring of a specified veteran who works in a field of renewable energy. Defines "specified veteran" as any veteran who is certified as: (1) having received a credential or certification from the Department of Defense (DOD) of a military occupational specialty or skill in a field of renewable energy or with respect to advanced manufacturing, machinist or welding, or engineering; (2) having completed a vocational degree in a field of renewable energy; or (3) having completed a LEED (Leadership in Energy & Environmental Design) certification with the United States Green Building Council.