So what you are saying is that if materials are acquired via means other than purchasing them outright, i.e., subcontracting, travel, indirect costs, etc., then "materials" can be billed on a labor hour contract?
I was taught that "materials or ODCs" could only be included on a T&M contract not a labor hour.
From 52.232-7 (b)(1)(ii)
(A) Direct including supplies transferred between divisions, subsidiaries, or affiliates of the Contractor under a common control;
(B) Subcontracts for supplies and incidental services for which there is not a labor category specified in the contract;
(C) Other direct costs (e.g., incidental services for which there is not a labor category specified in the contract, travel, computer usage charges, etc.); and
(D) Applicable indirect costs.