Thank you for posting your request on History Hub. In regards to vital records, birth, death, marriage, divorce, etc., these records are state level records, and are generally not available online free of charge. They are also not in the custody of the National Archives.
Name changes which were conducted as part of the naturalization process may be contained within the records of the court where the naturalization took place. Name changes not conducted as part of naturalization are probate records, and you would need to locate the probate court in the area where you believe the name change occurred to determine if you can obtain a copy and how much it might cost.
However, be aware that, given the date ranges of these records, many of these may still be covered by privacy laws. You would need to reach out to the office of vital records for each of the states in which the events occurred, to inquire as to what their policies are in regards to ordering copies of these records and what fees are required, or if they can be waived.
In regards to military records, many records are digitized online for WW1 and older military records through our partners, such as Ancestry,com and Fold3.org. While these are both paid services, many local libraries have subscriptions which you can utilize free of charge. Again, privacy issues may come into play if these records are newer than WW1. WW2 is within the public record realm, but these records are still in the process of being digitized and placed online. For the most recent records, those of Korean, Vietnam, Desert Storm and more recent, these are all within the 75 year privacy restriction, and are not available online.
I am sorry that I cannot provide better digital solutions, but I hope this will be helpful in aiding you in pursuing your research.
Since most of the deaths are recent, you should ask the person(s) who served as the executor of their estates or their next of kin for a copy of the death certificates, since they would have a copy.
If you are going down the path of only free records than here are some examples of what is curently available:
Gilbert Garza ESCAMILLA b 25 Feb 1921 Asherton, Dimmit Cty, Texas; d 3 Sep 1988 Los Angeles, CA; burial Riverside National Cemetery, Riverside, Riverside, CA (Buried at: Section C Site 213); Son of Pablo ESCAMILLA & Paz GARZA
Various sources (NB FamilySearch is free, but you’ll need to sign up first):
- 1921 Baptism - Catholic Church. Immaculate Conception, Asherton, Texas (#686): https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSXY-49Q2-6?i=237
baptism for a sister in 1923: https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSXY-49QV-M?i=325
baptism for a brother in 1926: https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSXY-49QX-L?i=465
- 1940 US Census: https://www.familysearch.org/ark:/61903/1:1:K4WH-FW7
- Social security application files: https://aad.archives.gov/aad/display-partial-records.jsp?f=5138&mtch=2&q=450224641&cat=all&dt=3061&tf=F&bc=sd
- Social Security Death Index: https://familysearch.org/ark:/61903/1:1:JLFP-X6N or https://aad.archives.gov/aad/record-detail.jsp?dt=3019&mtch=2&cat=all&tf=F&bc=sd&rpp=10&pg=1&rid=703368&rlst=703368,703140
- California Death Index, 1940-1997: https://familysearch.org/ark:/61903/1:1:VP86-WTN
Marriage: 17 Oct 1975 (religious: 28 Oct 1975) Clark, Nevada – Nevada Marriage index: https://familysearch.org/ark:/61903/1:1:VVYP-T57
Sydney Beatrice SMITH (nee ROSS) b 22 Nov 1922 Rupert, Minidoka Cty, Idaho; d 10 Mar 2010; daughter of James Thomas ROSS and Pearlie May MARSHALL; First husband: Orson B SMITH
- 1925 LDS census: https://www.familysearch.org/ark:/61903/1:1:83K4-2G2M
- 1930 US census: https://www.familysearch.org/ark:/61903/1:1:XH6G-P3H
- 1940 US Census: https://www.familysearch.org/ark:/61903/1:1:VT4H-4JR
- 1960 LDS Census with first husband Orson SMITH and daughter Tara SMITH: https://www.familysearch.org/ark:/61903/1:1:D4LG-BWZM
- Social Secirity Death Index: https://familysearch.org/ark:/61903/1:1:JTKP-624
- Mother Pearlie’s grave and bio: https://www.findagrave.com/memorial/33241555/pearlie-may-bartlett