Dear Ms. Steffen,
Thank you for posting your request on History Hub!
The Federal Government does not ordinarily create or maintain birth, death, marriage or divorce records. Such records are made and kept by state and local governments rather than the National Archives. Therefore, we searched for Walter James Pulkinen and Joanne Marie Deschaine on FamilySearch and located a 1959 Maine marriage record dated June 1, 1959, as well as 618 results for Walter and 129,358 results for Joanne. FamilySearch does not charge to use their site but do require that you set up an account. Or you may view these records online at one NARA's facilities for free (without an account) via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/.
We hope this is helpful. Best of luck with your family research!