However , the nature of these Federal physical assets that are classified as stewardship PP and E differ from general PP and E in that their values may be indeterminable or may have little meaning ( for example , museum collections , monuments , assets acquired in the formation of the nation ) or that allocating the cost of such assets ( for example , military weapons systems and space exploration hardware ) to accounting periods that benefit from the ownership of such assets is meaningless .
These assets should be allocated to accounting periods .