; (ii) changes in training or policy; (iii) changes in communications with veterans; and (iv) oversight of the Program by the Department. (k) Definitions In this section: (1) Mental Health Residential Rehabilitation Treatment Program The term Mental Health Residential Rehabilitation Treatment Program — (A) means the array of programs and services of the Department that comprise residential care for mental health and substance use disorders; and (B) includes the programs designated as of the date of the enactment of this Act as domiciliary residential rehabilitation treatment programs. (2) Treatment track The term treatment track means a specialized treatment program that is provided to a subset of veterans in the Program who receive the same or similar intensive treatment and rehabilitative services. (3) United States The term United States means the 50 States, the District of Columbia, the Commonwealth of Puerto Rico, Guam, the Virgin Islands, American Samoa, and any other commonwealth, territory, or possession of the United States. 304. Electronic document submission option for the CHAMPVA program (a) Online portal Not later than 18 months after the date of the enactment of this Act, the Secretary of Veterans Affairs shall publish an online portal allowing— (1) individuals applying for medical care under section 1781 of title 38, United States Code, the ability to— (A) submit application materials electronically; (B) view the status of their application online; and (C) select their preferred method of communication regarding their application, which the Department of Veterans Affairs shall use upon their first attempt to contact the individual if there are any issues with their application; (2) individuals applying for or receiving medical care under such section the ability to submit electronically— (A) documentation regarding other health insurance certification; (B) documentation regarding school enrollment certification