BEIJING — An insider critique of corruption in China’s military, circulating just as new leadership is about to take over the armed forces, warns that graft and wide-scale abuses pose as much of a threat to the nation’s security as the United States.

Col. Liu Mingfu, the author of the book, “Why the Liberation Army Can Win,” is not a lone voice.

Earlier this year, a powerful army official gave an emotional speech describing corruption as a “do-or-die struggle,” and days later, according to widely published accounts, a prominent general, Gu Junshan, a deputy director of the logistics department, was arrested on suspicion of corruption. He now awaits trial. The general is reported to have made huge profits on illicit land deals and given more than 400 houses intended for retired officers to friends.

Those excesses may be mere trifles compared with the depth of the overall corruption, the speech by Gen. Liu Yuan, an associate of the new party leader, Xi Jinping, suggested.

For Mr. Xi, who boasts a military pedigree from his father — a guerrilla leader who helped bring Mao Zedong to power in 1949 — China’s fast modernizing army will be a bulwark of his standing at home and influence abroad.