Three members of the armed forces and two veterans are believed to have taken their own lives last month.
They are among more than 80 suspected suicides among serving and former personnel this year – already more than the 75 who died in 2019.
Veterans groups previously warned many have struggled mentally with the months of lockdown.
One former soldier, Trevor Coult, who won the Military Cross during the Iraq War, said the Ministry of Defence should hang its head in shame over the deaths.
The ex-sergeant, who has PTSD, said: “These deaths are an absolute tragedy. How many veterans and service personnel have to die before the MoD admits it has a major problem with suicide?”
The five latest deaths happened in the three weeks up to November 30.
The first to die was Iraq War veteran Robert McCormack, 36, who was found in the Reddish Vale area of Stockport on November 9 after his family reported him missing.
Robert, who left a daughter, had struggled with PTSD and depression after leaving the Army eight years ago.
His unit of the Cheshire Regiment was involved in fierce fighting during the war.
His devastated sister Claire said: “He would do anything for anybody. He was a gentle giant.”
Mum-of-one Amy Womersley, a decorated RAF senior NCO based at RAF Leeming, North Yorks, was found dead on November 21.
The IT technician, who was in her mid 30s, had been in the RAF for almost 18 years after joining in 2003.
Friend Debra Roberts wrote on a Just Giving page to help raise funds for the mental health charity Mind: “She has left an Amy shaped hole in the world for her son, family, girlfriend, friends, RAF colleagues, and anyone who ever met her.”
Three days later Corporal Barry Wright was found dead at Bulford Camp in Wiltshire – where others have killed themselves in recent months.
The 37-year-old member of the Royal Regiment of Fusiliers and veteran of Iraq and Afghanistan was married with three kids.
Brother George Wright wrote on Facebook : “He was loved by everyone he came into contact with. My eyes are so sore as they’re full of tears.”
Ex-soldier Oli Wilkes was found dead on November 26 after going missing.
Mum Camille Meakin said: “My amazing, caring, loving, brave son was found late last night by police after sadly taking his own life. Oliver had struggled with mental health issues for a very long time.”
The fifth to die was Sapper Nick Edwards, a member of 36 Engineer Regiment.
His sister wrote: “It has been normalised for men to not speak about their problems and keep everything bottled up. This stigma needs to be stopped and we should be doing more to help.”
The Sunday People is campaigning for an overhaul of how the Ministry of Defence deals with mental problems in the military.
The MoD said: “Any death among serving and former personnel is a tragedy. Our sympathies remain with families affected at this extremely difficult time.”