1941 P. Larkin Let. 17 Apr. in Sel. Lett. (1992) 13 I can quite believe his description of the OCTU; but it only bears out my belief that sensitivity butters no parsnips.

1972 D. McLachlan No Case for Crown iv. 56 He reminded me sometimes of a sergeant who gave me hell in my O.C.T.U.

1990 Antiquaries Jrnl. 70 6 We resumed our OCTU training, and in due course most of us were commissioned in December and posted away to RE units of various kinds.