Is an oath of office a valid contract under the laws and constitution?

QUESTIONS PRESENTED 1.) (Is a OATH OF OFFICE a valid Contract under the Laws and Rules of this United States and the Constitution??? 2.) Does the taking of a OATH OF OFFICE, provide the taker a valid property interest under the Due Process Substanive Clause of the Constitution of the United States 2? 3.) Did the Lower Courts ABUSE OF DISCRETION by not considering Pro Se Plaintiff's [FACTS] that, he was allowed to begin ~ work and continue to work with out signing any other documents other then the OATH OF OFFICE 272 4.) Did the Appellate Court error in concluding, that Pro se Plaintiff Kampfer had no property interest, fundamentak or otherwise in the DCO position 27272? , e lage § ‘ . 4 ~“ .