RELEASED BY O.N.I. Is this civil censorship?

Hello all members
For your consideration, I upload a postcard with Washington D.C . handstamp (U.S. Fleet Post Office) dated Sept. the 4th, 1945 over a Panamanian postage and blue censor mark RELEASED BY O.N.I., addressed to New Hampshire . As far as I know. O.N.I. stands for Office of Naval Inteligence, a section of the U.S. Army. But it looks like a regular civil mail: no APO, no Army censor.......
Any help/information will be welcome.
Many thanks
Jose M.
For your consideration, I upload a postcard with Washington D.C . handstamp (U.S. Fleet Post Office) dated Sept. the 4th, 1945 over a Panamanian postage and blue censor mark RELEASED BY O.N.I., addressed to New Hampshire . As far as I know. O.N.I. stands for Office of Naval Inteligence, a section of the U.S. Army. But it looks like a regular civil mail: no APO, no Army censor.......
Any help/information will be welcome.
Many thanks
Jose M.