Melanie Callaway, right, hikes the trail with her friend Lori Bright. Callaway was sentenced to perform community service after being charged with trespassing on a hike earlier this year. (Stephen Osman / Los Angeles Times)
Melanie Callaway, left, and Lori Bright look at a structure on the base that security officials sometimes use as a guard station. (Stephen Osman / Los Angeles Times)
Hikers make their way back to the trail head after turning around because of the barricade. (Stephen Osman / Los Angeles Times)