2015/16 when you first posted - sometimes people put things on the back burner for a while, which is why I thought it might be worth another look - RJ must have had the same thought - you probably have the California, U.S., Federal Naturalization Record - District Court - Southern District of California.
Mildred Marie Rayson - 27 July 1891 - declaration 9 March 1943 Los Angeles California - aged 51
Declaration Place Los Angeles, California. Occupation was bacteriologist.
Declaration Number 119670 - father relatives were all English and mothers all Virginians.
https://www.rootschat.com/forum/index.php?topic=739549.0U.S., Department of Veterans Affairs BIRLS Death File - Name: Mildred Rayson
Death Date 2 Jun 1984
Enlistment Date 17 Sep 1918 - Release Date 20 Jul 1920
U.S., Veterans Administration Master Index - Mildred Marie Rayson (birth year varying but tha'ts not so unusual)
Record Type Military Service
Birth Date 27 Jul 1892 - Military Date 20 Jul 1920
Residence Place Chicago, Illinois.
Fort Sheridan - Deerfield Lake Illinois on the 1920 census - Army Nurse Corps on duty in hospital.
https://www.familysearch.org/ark:/61903/3:1:33SQ-GR6G-836?i=44&cc=1488411U.S., City Directories - 1961 - h 106 Robinson Avenue. San Diego. California.
Us City Directory - 1942 - 815a St Louis av - Long Beach California - Labtry Techn. Community Hospital.
Sandra