there is an apparently irreducible military need for a marching soldier to bear on his body about 50 lb of extraneous weight.The larger and stronger the soldier,the more readily can he carry such a load the desirable marching norm of twenty miles a day.

红色部分的部分应该如何分析？是作为load的同位语还是作为carry such a load的状语？希望老师解答，谢谢。