The poem on the overlook's lowwalls is called "The Young Dead Solders" by Archibald MacLeish who served as an artillery officer in World War I.
Read the complete poem at http://www.artandarchitecture-sf.com/tag/national-cemetery.
From the overlook to the Bay Area Ridge Trail above Arguello: 27
Ecology Trail down to El Polin Spring from Inspiration Point Overlook and back up the east side: 28 thru 35
Out of the park at Spruce: 36, 37