The placard under Mao reads:
"The People’s Liberation Army must support the Leftist masses. – Mao Ze Dong"
The books, of course, say "The sayings of Chariman Mao"
The lower inscription reads:
"The Army and the People must unite as one to watch the land for enemies."
via If Charlie Parker Was a Gunslinger, There’d Be a Whole Lot of Dead Copycats