NPCA's Timeline: 1941-1960
| 1943: |
NPA successfully works to keep the trees within Olympic National Park safe from WWII lumber production. |
| May 17, 1945: |
NPA's first president and founder, Robert Sterling Yard, dies after 30 years of service. |
| March 1954: |
NPA members join U.S. Supreme Court Associate Justice William O. Douglas in an eight day hike to advocate for the preservation of the Chesapeake and Ohio Canal. The demonstration helped stop plans for a proposed parkway on top of the canal and lead to the creation of the C&O Canal National Historical Park. |
| January 27, 1956: |
 In preparation for the 50th anniversary of the National Park Service, the White House and Congress launched Mission 66, a 10-year commitment of $1 billion to support restoration efforts and construction of roads, campgrounds, and visitor centers throughout the under-funded and heavily-visited park system. NPA carefully monitors new development and construction in the park. |
| 1959: |
NPA fosters the creation of the Student Conservation Program, which later becomes the Student Conservation Association in 1964. |
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