The US immigration laws contain several discretionary provisions to assistant members of the US Armed Forces. One of them is Military Parole in Place ( a/k/a P.I.P.)

USCIS may grant parole in place on a case-by-case basis for urgent humanitarian reasons or significant public benefit. You may be eligible for parole in place in one-year increments if you are the spouse, widow, parent, of child of an:

• Active-duty member of the U.S. armed forces;
• Individual in the Selected Reserve of the Ready Reserve; or
• Individual who (whether still living or deceased) previously served on active duty or in the Selected Reserve of the Ready Reserve and was not dishonorably discharged.