Home Guard

You have your army, perhaps it is a Badass Army, or just a Redshirt Army, but in any case, it is the standing army of your nation, with everything that entails. Of course, not everybody in the army does it for a living. Some folks just do it for the bit of extra pay, or the college benefits, or as a way to keep connected with the military after they retire and settle down to start a family.

These guys are the Home Guard. Typically, they will get called up when the nation goes to war, or in the event of a natural disaster or civil unrest. Many of them will be military veterans who got out of the regular army, or folks who had imminent life plans that precluded being away from home permanently. In more desperate situations, the Home Guard might include people who otherwise would not have been accepted into the military, but are being organized into a militia as a last ditch defense of their homes. Depending on a variety of circumstances, they might be equipped with obsolete weapons and equipment from decades past, or even less. In more ideal situations, they will use the same equipment as the regular troops, to better allow them to serve along side them in combat when needed.

Even the version of the trope where the Home Guard is little more than a Ragtag Bunch of Misfits armed with whatever they have on hand, it can be Justified as freeing up more troops to fight the enemy before they can invade the home country.

In practice, these forces might also be called the Reserves or the Militia, with either name (in the United States, at least) carrying different connotations. From an American point of view, "Militia" sounds more like Training the Peaceful Villagers at best, and more like "Right-Wing Militia Fanatic" at worse. "Reserves" gives more of an impression of professional soldiers (again, from an American audience's perspective.)

If they end up getting invaded and defeated, expect these guys to help form La Résistance.

Named for the British Home Guard troops who were formed to protect Great Britain in the event of German invasion during World War II.

See also Training the Peaceful Villagers and Instant Militia.

Film
"Robin: My father couldn't get me into the National Guard. Crowd: Oooooooohh... "
 * Bedknobs and Broomsticks. The World War 2 British Home Guard appears several times in the movie, including firing at the retreating Nazi commandos. They even have their own song, "The Soldiers of the Old Home Guard".
 * Clash of the Titans: In the remake, the Dwindling Party of soldiers assigned to help Perseus in his mission are from an Honor Guard, distinguished soldiers too old to fight on the front lines or young inexperienced soldiers who look good in formation. They are all he gets because the rest of the Argosian army had recently been wiped out after picking a fight with Zeus and Hades.
 * Robin Hood: Men in Tights: The Sheriff and his men. Robin takes a cheap shot at the Sheriff, who seized his family's property while Robin was fighting in the Crusades.


 * The Big Red One. The Squad find themselves confronted by Volksturm armed with pitchforks and pictures of Adolf Hitler. It looks like a massacre is about to take place, but they quickly surrender when the Sarge fires his gun over their heads.

Literature

 * Various characters in the Honor Harrington series are mentioned in passing as being members of their armed forces' Reserves. Typically, such characters will be a bit older and wiser than their similarly-ranked companions, and officers of the Grayson Space Navy reserve forces are mentioned as having slightly different rank insignia.
 * Frequently shows up in the Ryan Verse by Tom Clancy. In particular, a brigade of the North Carolina National Guard plays a pivotal role in Executive Orders, General Gennady Iosefovitch Bondarenko manages to field an entire division of reservists in The Bear And The Dragon, and John Kelly (later John Clark) is threatened with being recalled to active duty since he checked the box for joining the reserves in Without Remorse

Live Action TV

 * Battlestar Galactica: According to Word of God, Lee Adama was a member of the Colonial Fleet Reserves.
 * Dads Army: Based on the writers' experiences in the Home Guard during World War II. Most of the humour stems from the fact that the members are too old, too young, or just incompetent in that bumbling English way.
 * Horrible Histories has had several sketches about the British Home Guard.

Music

 * Noel Coward's "Could You Please Oblige us with a Bren Gun?", about the travails of a unit belonging to the trope namer.

Video Games

 * In Wing Commander IV, Vagabond mentions that after the Kilrathi War ended, he took a billet in the Reserves, thinking it would be some easy money for little work now that they were at peace. So of course he got recalled to active duty for the next crisis.
 * Blair is also in the Reserves, and finds himself recalled as well (by Maniac, who throws in a mock-fanfare while issuing the order in a seedy bar).
 * In the Wing Commander novel End Run, Colonel Bondarevsky warns the pilots under his command that the pilots they'll find defending  will not be typical aging "Home Guard" pilot with "rusting armor", but rather a very well trained and equipped force of some of their most experienced and skilled pilots.
 * Also from Wing Commander IV, we have the Border Worlds Militia. In the game, they are shown to be a somewhat ragtag force with modern (if somewhat nonstandard compared to what Confed flies) equipment. In the Novelization, they are flying barely-holding together ships that would have been at home on the flight deck of the Tiger's Claw ten or twenty years earlier.
 * Valkyria Chronicles: The Gallian Militia unit that the protagonist commands is an example of a homeguard, constituting members of the nation from all ranks: singers, wealthy heiresses, university students, bakers...

Tabletop Games

 * The Warhammer 40000 equivalent is the PDF (Planetary Defense Forces). Their quality is variable: depending on the people settling there (usually long-serving Guard regiments), a planet's PDF could be those of a sedentary population too stupid to dodge the draft or a bunch of veterans from one of the Imperial Guard's more experienced and successful regiments. Nonetheless, they are considered as underequipped and far less competent by the Imperial Guard. We repeat: the Imperial Guard, Butt Monkey Cannon Fodder extraordinaire, believes the PDF to be beneath them.
 * The Cadian Interior Guard is one of the better-equipped PDF units—one in ten soldiers, regardless of skill, are recruited to the PDF, so Cadia actually has a home guard better than many planets' best troops. Seeing how as Cadia is a World of Badass sitting right in front of a giant Hell Gate Negative Space Wedgie, it's probably for the best.
 * The planet of Perlia got a "speedbump's speedbump" in the form of the Planetary Defence Volunteers, established by Ciaphas Cain in the sixth novel of the series. The author also used it as a chance to make an extended Shout-Out to Dads Army.

Truth in Television

 * The Trope Namer is the British Home Guard, formed during the early years of World War II (and disbanded soon after, when they were no longer needed).
 * Normally the role is taken by the Territorial Army, which was formed in 1908 and currently forms about a quarter of the British Army's manpower. Since the TA was automatically mobilised when the war started, they needed a 'reserve for the reserves' once things got worse.
 * It was never quite as poorly-equipped as some fictional examples, however; whilst most of its members were exempt from the draft by virtue of age or a minor disability, most agricultural workers were exempt from the draft, and a fair percentage of them owned their own shotguns and varmint rifles which they knew how to use.
 * In the U.S. this is called the National Guard, which traces its lineage back to 1636, with the formation of the Massachusetts Bay Regiments, local militias formed together by the colonial government into larger units so they could more effectively deal with the Pequot tribes.
 * In modern times, National Guardsmen typically are equipped with the same gear as their "Regular" Active Duty brethren, although up until the later years of the Cold War, it wasn't unusual for them to use obsolete equipment that had been cast off by the regular service, particularly for the Air Guard, since military aircraft are considerably more expensive than an infantryman's kit.
 * In addition to the National Guard, certain states even have a State Guard, essentially a National Guard writ small, which the Federal government has no claim to without the Governor's consent. These are typically intended to guarantee that the state will have at least a small reserve force of trained personnel if a crisis arises locally while the National Guard is deployed elsewhere.
 * The Civil Air Patrol is a civilian organization whose mission includes serving as an Auxiliary of the Air Force when needed. They are known for their red and white Cessnas, which they use both for pilot training and for performing search and rescue operations over the American wilderness.
 * They also serve a function similar to the Boy Scouts or Junior ROTC, training youths and giving them something to do with their free time and giving them a chance to help their communities (among other things, kids in the organization can be trained and serve as Observers on official CAP missions, aiding in Search-and-Rescue operations, and many of them are certified as Disaster First Responders.)
 * Those brightly colored civilian airplanes they fly around in? During World War II, they became something of a Lethal Joke Character, when the CAP flew yellow-and-red Piper Cubs off the coasts looking for German U-Boats. There was little one of these planes could do to a U-Boat, given that they were unarmed (at first), but they could use their radios to call for the Air Corps, who would happily send a bomber to blow the interloper out of the water.
 * Although it is very rare, the Boy Scouts themselves have been known to serve in this role in particularly trying times. The Polish Boy Scouts fought against the Germans during World War II as part of La Résistance, often serving as scouts and messengers, and at one point late in the war even using tanks that they had captured from the Germans to help liberate a Concentration Camp.
 * Near the end of World War 2 Nazi Germany had the Volkssturm. Military service has been part of German culture for decades, so in theory, the Nazis would be able to scrounge up a massive reserve force that could hold off the Soviets. However, in practice, the majority of Volkssturm members were old men and veterans of the First World War. It pretty much boiled down to giving someone a gun and hoping they could kill enough Russians.