Sir: We are to be denied the facts of the court martial of the late Michael Calvert ("The shaming of a hero", 5 May) because the records are sealed for 75 years, until 2028. I have always assumed that the main reason for sealing records, apart from national security, was to protect governments and civil servants from the opprobrium of incompetence or misjudgement. To seal the record of a court martial for 75 years suggest misjudgements of a truly staggering order. Are not the remaining friends of a man of unbelievable courage entitled to know the truth?
J G MIGHELL