Death Certificates http://www.portal.state.pa.us/portal/server.pt/community/research_topics/3162/ancestry_com_pennsylvania/1575348
Pennsylvania residents get free access to Pennsylvania Death Certificates. Go to the above url, scroll down and put in a valid Pa Zip code (19344 works for me). Scroll down and click the blue Pa Archives line and a search engine will appear.
currently, deaths from 1906 to 1944 are available. By December 2015, up to 1966 will be available and then an additional year as we move forward.
Good luck with your research.
BTW: The American Mechanic's Cemetery records are housed at the Chester County Historical Society in West Chester, Pa.