All this talk about Eagles and personnel got me to doing a little research.
Thanks to 'The Catacombs' website here is list of every Eagle and every fatality across Space: 1999's two seasons:
Note that the highest numbered Eagle seen/mentioned onscreen is Eagle 29 in the episode 'Collision Course' (so figure maybe 30+ Eagles stationed at Moonbase Alpha prior to the episode 'Breakaway') and that Season Two has the fewest number of fatalities.
Space: 1999 – Personnel/Eagles
Season One
Breakaway
Personnel – 311. Numerous fatalities including Jim Nordstrom, Eric Sparkman, Frank Warren. The population of 311 is presumably the figure just before the 'Breakaway', which killed several pilots. 311 – 3 = 308
Eagles - Eagle 1 (Simmonds, V.I.P. pod); 2 (Earth shuttle); 14 (cargo); 26 (cargo); Collins' Eagle; Koenig's NDA1 Eagle (crashed); remote Eagle (crashed); at least two cargo Eagles destroyed.
A Matter of Life and Death
Personnel – 0 Fatalities
Eagles – Eagle 1, Eagle 2
Black Sun
Personnel – 1 Fatality. 308 – 1 = 307
Eagles - Eagle 1 (Ryan, destroyed); 5 (lifeboat); Alan's laser Eagle
Ring Around the Moon
Personnel - 2 fatalities: Ted Clifford, Donovan. 307 – 2 = 305
Eagles - Eagle 1 (Koenig); 3 (Alan & Donovan, crashed)
Earthbound
Personnel - 1 left Alpha: Simmonds (presumably deceased). 305 – 1 = 304
Eagles - Eagle 1 (Alan, Rescue); 2 (Rescue)
Another Time, Another Place
Personnel – 1 fatality, Regina Kesslann. 304 – 1 = 303
Eagles – Unnumbered Eagles travel to the second Moon and Earth
Missing Link
Personnel – 0 fatalities
Eagles - Eagle 1 (crashed); 4 (Rescue); 7 ("Cargo", with a winch platform)
Guardian of Piri
Personnel – 1 fatality, Sarah Graham. 303 – 1 = 302
Eagles – Eagle 4 (Koenig's final Eagle); 6 (Irving and Davis); 10 (Medical); 24 (Alan); 26 and 27 (named)
Force of Life
Personnel – 4 fatalities, Anton Zoref, Hilary Preston, Mark Dominix, guard. 302 – 4 = 298
Eagles – None
Alpha Child
Personnel – 0 fatalities. One birth. 298 + 1 = 299
Eagles – There is a flight of 3 Eagles, unnumbered
The Last Sunset
Personnel – 0 fatalities
Eagles – Eagle 1 (search); 2 and 7 (initial probes); 4 (corrosion proof); 9, 12,1 4, 15, 19, 24 (named); 28 (crashed)
Voyager’s Return
Personnel – 2 fatalities, Ernst Queller, Abrams. 299 – 2 = 297
Eagles – Eagle 1 (Alan); 2 (Abrams, destroyed); 4, 5, 6, 9, 10 (defense flight)
Collision Course
Personnel – 0 fatalities
Eagles – Eagle 1 (Alan); 4 (Rescue); 10 (bomb, no pod); 11, 12, 29 (named)
Death’s Other Dominion
Personnel – 0 fatalities
Eagles – Eagle 1
The Full Circle
Personnel – 1 fatality, Sandos. 297 – 1 = 296
Eagles – Eagle 1 (Koenig); 2 (Alan); 3 (Victor); 6 (original landing party)
End of Eternity
Personnel – 2 fatalities, Mike Baxter, Orderly. 296 – 2 = 294
Eagles – Unnumbered initial Eagle and laser Eagle
War Games
Personnel – 0 fatalities (128 dead in the alternative timeline plus Koenig and Carter)
Eagles – Eagle 1 (Alan: internal number is 9); 2 (in flight 1); 6 (Koenig, unarmed); others. In the end none are destroyed.
The Last Enemy
Personnel – 0 fatalities
Eagles - Eagle 1 (Alan); 2, 5
The Troubled Spirit
Personnel - 3 fatalities, Dr. James Warren, Laura Adams, Dan Mateo. 294 – 3 = 291
Eagles – None
Space Brain
Personnel - 3 fatalities, Cousteau, Wayland, Kelly. 291 – 3 = 288
Eagles - Eagle 1 (Wayland and Cousteau, destroyed); 4 (Rescue); 7 (Koenig, fastest); remote Eagle (crashed); cargo Eagle.
The Infernal Machine
Personnel - Unknown number of fatalities: perhaps 2 laser tank crews (so two crewmen in each tank? 2 + 2 = 4), 3 Eagle pilots. 288 – 7? = 281
Eagles - Eagle 1 and 2 (armed); 4 (supply) (2 Eagles are destroyed)
Mission of the Darians
Personnel - 1 fatality, Lowry. 281? – 1 = 280?
Eagles - Eagle 1 with passenger module.
Dragon’s Domain
Personnel – 1 fatality (Tony Cellini). 280? – 1 = 279?
Eagles - Eagle 1 (Cellini, left with Ultra probe); 2 (pick up); 3 and 4 (escort)
The Testament of Arkadia
Personnel – 2 deserters: Luke Ferro, Anna Davis. Bergman says there are over 300 people on Alpha. Note by The Metamorph there are just 297. 279? – 2 = 277?
Eagles – Eagle 1 (initial landing party); 2 (unarmed survey); 3 and 5 (pursuit); 4 (Luke and Anna, left on Arkadia).
Season Two
The Metamorph
Personnel – 297. 3 fatalities, Ray Torens, Lew Picard, Eagle pilot. One addition, Maya, so the population at the end of the episode is 295.
Eagles – Eagle 1 (Fraser, destroyed with planet); 4 (rescue); 5 and 6 (combat). Three Eagles are destroyed- Eagle 1, the remote bomb Eagle, and an Eagle over a launch pad.
The Exiles
Personnel – 0 fatalities
Eagles – Eagle 4 ("Rescue"); Recovery Eagle
One Moment of Humanity
Personnel – 0 fatalities
Eagles – None
All That Glisters
Personnel – 0 fatalities
Eagles – Eagle 4 ("Rescue")
Journey to Where
Personnel – Population 297. 0 fatalities
Eagles – None
The Taybor
Personnel – Population 297. 0 fatalities
Eagles - Eagle 1 (Andrews); two others
The Rules of Luton
Personnel – 0 fatalities
Eagles - Eagle 1 (Koenig); 4 (replacement)
The Mark of Archanon
Personnel – 1 fatality (possibly). 295 – 1 = 294
Eagles - Eagle 1 (Koenig); 3 (rescue)
Brian the Brain
Personnel – 0 fatalities
Eagles - Eagle 1 (Tony); 2 & 10 (investigation).
New Adam, New Eve
Personnel – 0 fatalities
Eagles – Eagle 1 (Alan); 4 (Koenig)
Catacombs of the Moon
Personnel – 0 fatalities
Eagles – Eagle 1 (Koeing)
The AB Chrysalis
Personnel – 0 fatalities
Eagles – Eagle 1 (Koeing)
Seeds of Destruction
Personnel – 0 fatalities
Eagle – Eagle 1 (Koeing, Tony)
The Beta Cloud
Personnel – 1 fatality (Tom Graham). Three guards are attacked and left injured or dead for the duration of the episode. 294 – 1 = 293
Eagles – Eagle 6 (Graham)
Space Warp
Personnel – 0 fatalities
Eagles - Eagle 1 (Koenig); 2 (Refueling); 4 (Maya, crashed)
A Matter of Balance
Personnel – 0 fatalities
Eagles – Eagle 1 (Koenig); 2 (Shermeen)
The Bringers of Wonder Parts 1 & 2
Personnel – 1 fatality, Clive Kander. 293 – 1 = 292
Eagles – Eagle 10 (Koenig, crashed); 1 (Pursuit Eagle, although spacesuit badges indicate Eagle 5). Unnumbered Eagle used by Alan (spacesuit badges indicate Eagle 2).
The Lambda Factor
Personnel – 2 fatalities, Sally Martin, Mark Sanders
Eagles – None
The Séance Spectre
Personnel – 1 fatality (Greg Sanderson). 292 – 1 = 291
Eagles – Eagle 1 (Koenig - 2nd, crashed and damaged); 2 (Koenig - 3rd); 3 (Tony); 4 (Koenig - 1st); 6 (Alan).
Dorzak
Personnel – 0 fatalities
Eagles – None
Devil Planet
Personnel – 298 population (1 more than The Metamorph). 1 fatality, Blake Maine. 298 – 1 = 297
Eagles – Eagle 1 (Koenig, crashed); 2 (Fraser, rescue).
The Immunity Syndrome
Personnel – 4 fatalities, Lustig, Les Johnson, 2 others. 297 – 4 = 293
Eagles – Eagle 1 (disintegrated on ground); 4 ("Survey", crashed); 3 (Fraser).
The Dorcons
Personnel – 2 fatalities, Thompson, another pilot. 293 – 2 = 291
Eagles – Four combat Eagles including Eagle 4 are destroyed.